So why do you lose your reaction when you use a bonus action spell but not when you do other bonus actions such as bardic inspiration?
The sneak attack rules clarified that a reaction on someone else's turn is not your turn. Not "to". "on".
And of course if someone pushes you off a cliff on their turn, then you are casting feather fall on their turn. But that's not the question Crawford was responding to in his tweet.
So why do you lose your reaction when you use a bonus action spell but not when you do other bonus actions such as bardic inspiration?
And this is exactly where I’m confused.
If I cast a spell as a bonus action, then somebody pushes me off a cliff, can I cast feather fall on their turn?
Apparently not.
I will reiterate that the rule, as clarified by tweet by Jeremy Crawford is that you cannot cast a spell as a reaction if you have already cast a spell as a bonus action. I wouldn’t want to be accused of disseminating misinformation...
Sure you can. As long as they pushed you off on their turn and not your turn (for example, if you cast misty step and they had a readied action to shove you when you appeared next to them). Why would you think you couldn't?
On your turn. You can still cast a spell as a reaction on someone else's turn, after your turn ends (assuming you cast a bonus action spell on your turn).
The rule itself is simple. The consequences of the rule can feel counter-intuitive though.
Oh, no. Come back from the Dark Side. That's not the case.
Jeremy responded to my tweet. For some reason I can't pull up his response on the Twitter site, so I'll have to type it:
My question: Can you cast a spell as a bonus action, a cantrip as an action, and a spell as a reaction in the same round?
Jeremy: Casting a bonus action spell means no other spells that turn but a cantrip with a casting time of 1 action.
Again, the use of "that turn" which is exactly the problem in my mind. It's really "that round" as best as I can understand. He continues to say "no other spells but cantrip." Further more, if the rule is "cantrip with a casting time of 1 action" then you can't ever use your reaction to cast a spell in this circumstance, even if it is a cantrip with a casting time of 1 reaction.
So I asked: Why fireball then feather fall, but not misty step then feather fall? There are no cantrips with a CT of reaction.
We'll see if he answers.
But no, the official rule is that once you cast a spell with a casting time of 1 bonus action, you've forgone the possibility of casting a spell with a reaction in that entire round.
So the cleric cant cast Guiding Bolt and then drop a Healing Word on a buddy? Ooops.
Yes.
Again, which is most likely?
That the rules thought it completely obvious that reactions are exceptions to things happening on turns to a degree it never mentions or explains the rule even once, and that each device tweet just happens to always have an alternative explanation...
...or that three guys on the Net initially misread a rule that truthfully IS wonky, but then couldn't admit their error and instead refuses to listen to reason, desperately misinterpreting Sage Advice and ignoring pretty obvious hints.
Not to mention they show the telltale signs: a focus on denying evidence rather than support for their own position.
This I leave up to each reader to decide.
But tell me this. If you have "cleave" (the part of GWM where you gain a bonus attack if you drop a foe) and you kill a goblin as a reaction on your turn, do you get your bonus attack?
By the conspiracy reading, the answer would be no, which is ridiculous.
That is:
Bob the Barbarian says "I'll chop anything I see, then walk around the corner". He readies an attack, then moves.
When he rounds the corner there's a goblin - his readied action triggers! He attacks! He hits! He kills the goblin!
Now, Bob doesn't get to "cleave" because he didn't drop the foe on his turn, since reactions aren't part of a turn.
Huh?
Just another nail in the coffin: when a desperate read of the rules to avoid an undesirable rules effect leads to absurd effects elsewhere.
The conclusion is clear - a reaction is always part of a turn (somebody's turn). If that turn happens to be your own turn, the rule against casting non-cantrip spells when you have cast a bonus action spell prevents you from casting a reaction spell (unless that reaction spell is a cantrip, which I believe there are none in the game).
Zapp
Sent from my C6603 using EN World mobile app
The conclusion is clear - a reaction is always part of a turn (somebody's turn). If that turn happens to be your own turn, the rule against casting non-cantrip spells when you have cast a bonus action spell prevents you from casting a reaction spell (unless that reaction spell is a cantrip, which I believe there are none in the game).
Zapp
Sent from my C6603 using EN World mobile app

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