Does this interpretation mean, that an incapacitated wizard doesn't end his "at the end of your next turn" features, because he doesn't get to take a turn?
Does this interpretation mean, that an incapacitated wizard doesn't end his "at the end of your next turn" features, because he doesn't get to take a turn?
Except *every single rule* agrees with his interpretation.
If surprised, you take a turn first round, and just can't do anything. The rules say this... all of the rules say this, and they all work with this. There is no rule that says you don't take a turn if surprised... you are making that up.
And yes, even the fiction works. It happens all of the time where someone is taken by surprise, but can still react to the attack.
Standing in front of someone and punch him....
He does nothing, I hit him in the face. (He was surprised, I won init so he could not react.
He tries to move his head, I glance off of his cheek. (He was surprised, I lost init so he could still react.)
He realizes what I am doing, and punches me first. (He was not surprised, I lost init so he acted first.)
Assassinate: Starting at 3rd level, you are at your deadliest when you get the drop on your enemies. You have advantage on attack rolls against any creature that hasn’t taken a turn in the combat yet. In addition, any hit you score against a creature that is surprised is a critical hit.
Any character or monster that doesn’t notice a threat is surprised at the start of the encounter.
If you’re surprised, you can’t move or take an action on your first turn o f the combat, and you can’t take a reaction until that turn ends. A member of a group can be surprised even if the other members aren’t.
We were arguing over nothing this whole time. The rule is quite clear. If you get hit with Assassinate in the surprise round, you get auto-critted. Whether you acted or not is irrelevant. The critical ability is separate from the gaining advantage if a person hasn't acted on their turn. All this indicates is that the assassin will never get advantage on his attacks on his next turn because the individual will have taken a turn on his surprise round.
Just because you get a turn doesn't change the fact you are surprised until that entire round is over. If you roll a higher initiative than the Assassin, all that means is he won't get advantage on you for beating you on initiative. Likely he'll still get advantage for being hidden using Stealth. He'll still get his auto-crit for surprising you.
The only benefit provided by winning Assassinate is advantage on attack rolls if you haven't acted. Whether or not that is intended to carry over to the next round is up to the table until I see further clarification from Crawford. The auto-critical will occur during the surprise round regardless of the initiative rolled if the target is hidden.
I've seen multiple Assassins played. Getting that auto-critical is not hard. I knew something had to be wrong with what was being said in this thread. Now it is quite clear that someone was mixing what Assassinate does. Surprise auto-crit and advantage on attack rolls for target not taking actions on turn independent of each other.
There is no such thing as a surprise round, there is just being surprised. The term surprise round is never once used in the books.
Surprise lasts until the creature can do something, that is at the end of it's first turn when it can take reactions.
Since it can take reactions like cast the spell Shield, it is obviously not surprised anymore.
If you don't believe me here is Mike Mearls saying the exact same thing. http://www.sageadvice.eu/2015/07/30/how-long-surprise-last/
So you think the game designers should have to write, "They can't even talk" to account for Other Activity on your Turn and include Surprise in their step by step combat to follow the intent of the rule?
A person casually conversing is "taking an turn" as they walk?
You're basically saying that any time an NPC is casually talking, or for that matter walking down the street or moving in any way, they aren't surprised? You really going that far? Basically saying no one can be surprised unless they're standing still and are completely silent? Is that your interpretation?
You don't at all take into account that not being able to see your attacker before he acts would preclude that individual from acting? That the way the rule is written is an alternate way of saying, "they don't get to take a turn"? You're pulling stuff like they get to communicate even though they don't know the target is there from Other Activity clearly not in anyway intended to be used in the situation you are applying it to.
Explain to me how they can be surprised because they don't know the target is there because the target has not yet attacked, yet somehow communicate as though they are aware? How can you have it both ways?
How can a character act if he can't take actions and doesn't know the enemy is there?
You pulling RAW out of the books means nothing to me, especially when you're pulling out rules like Other Activity out of nowhere because this game doesn't have free actions. It is very much implied that you don't get to talk in a manner that makes it seem as though you are aware of the attack on your turn.
I want to know how you justify it in the fiction. 5E seems very intent on focusing on playing in a fashion that does not break the fiction. You seem stuck on RAW interpretations of rules read in a very narrow, anal manner regardless of the fiction behind the rule.
This means that when you take your turn, while doing other things, you can also communicate. Presumably, a surprised creature is shocked into silence. (Which is pretty important if an Assassin is to be able to assassinate somebody without a shout being let out to alert guards)
Regarding the ready an action ability. I have not had a chance to look at the rules and see if you take the ready action, or if readying an action is just something you are able to do. So it's possible that readying an action is something you do as part of taking your action, and it was a bad example.
And as I said further up the thread, moving is part of taking your turn.
Incase there is still confusion... Each player always has a turn. Each turn always has a beginning middle and end.
The shortest turn possible is one in which a player chooses, or is not able to actually take their turn and nothing happens.
It's perfectly reasonable to hear from the DM, "Up next.. Oh sorry, you are surprised, you can't take your turn. Are there any saving throws you need to roll at the end of your turn? No, ok great ... next."
I would double check that. I'm pretty sure that taking turns in exploration is mentioned as an option.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.