Lanefan
Victoria Rules
Yet that's how it feels in play.And this sentence explains nicely why you're in error here.
No-one is standing there for six seconds, frozen in time, while other creatures act. around them, one at a time.
Too much of an abstraction in this case, IMO.The round by round, turn based, cyclical nature of combat rounds are an abstraction, and not a reflection of some in game objective reality.
OK, a scenario:Assume an Orc and PC are standing off in melee combat. On the Orcs turn he takes the Withdraw action, and heads towards an open doorway at the other end of the room, ending his turn 30' away from the PC. On the PCs turn he then moves 30' towards that Orc, finishing that move adjacent to that Orc, and then makes an attack against the Orc.
While to us (at the table) it looks like the PC is frozen in time, while the Orc moves 30' away (ending his turn 30' away from the PC), from the perspective of the PC all in game observers of that combat, the PC and the Orc both (at the same time) raced towards the open doorway, the Orc backing off and with the PC in hot pursuit, swinging away as he does so, and never more than a few feet away from the Orc.
Orc init 19
PC Alpha init 16
PC Beta init 14
PC Charlie init 11
The Orc and PC Charlie start the round in melee with each other, in a big room. PC Alpha is across the room to the west, loaded bow in hand. PC Beta is also across the room next to Alpha, ready to lay down an AoE spell.
On its turn the Orc attacks PC Charlie then moves 30' north to the door. PC Alpha's turn comes up and she shoots at the Orc. PC Beta's turn comes up and he drops a fireball on the Orc. PC Charlie then moves his own 30' and attacks the Orc (let's for these purposes assume it survives what A and B did to it and there's still something left to attack

Now if as you suggest Charlie and the Orc in fact move across the room together in the fiction, then why doesn't Alpha's shot suffer penalties for shooting into melee and why doesn't Beta's fireball also hit Charlie? Because sure as shootin' neither of those things will happen at 98+% of tables; instead the Orc will in effect be counted as being on its own between init 19 and init 11 because movement is treated as a mini-teleport, while Charlie is still where he started.
I agree that the Orc and Charlie would realistically move together in the fiction as their fight moves north toward the door. But that has to be reflected in how everything else is handled during the round, right? Yet how often is it?
If one allows surprise to take up a whole 6-second round, yes. But it shouldn't; and this is why surprise needs its own subsystem such that the surprised target has no active defenses only for the very first attack - for example if someone with three attacks in a round catches a target by surprise, IMO only the first of those attacks should be against passive defense only and if it's the very first thing to happen in the combat it happens before initiative is even rolled (among many other things, this is one reason I always have people with multiple attacks or shots roll a separate initiative for each one)All the actions taken in a combat round, are all happening more or less simultaneously, over the space of approximately 6 seconds. Your 'initiative' check simply determines when your action gets to be resolved.
'Surprise' in 5E (or an attack 'outside of combat') is effectively rendering a creature deaf, mute and dumb, and unable to move or react for an entire 6 seconds worth of actions by an attacker.
This assumes anyone notices the King go for the knife and-or realizes what he's about to try to do with it. I make no such assumption; instead it's handled by die roll - are you caught off guard or not, and if you are you only get your passive defenses agains tthe King's first attack.As soon as there are imminent hostilities (such as a declared attack) the DM stops narrative time, provides a quick explanation why ('Suddenly as you talk to the King, the King reaches for a concealed knife, with murder in his eyes') and asks everyone to roll initiative, transitioning to combat time, to see what they do over the next six whole seconds.
If problem there is, it's with the abstraction level being too far removed from the in-fiction reality.The problem is not with the rules here; it's with your inability to see the abstraction of combat and turns for what it is.