I think the problem with this is "attempting" to move out of reach does not trigger an AOO. Only actually moving out of reach does.The enemy doesn't have to move after being hit by an Opportunity Attack according to the Devs
So the sequence would go more as follow. Enemy is sheathed in booming energy to start his turn and right next to me.
Enemies Turn:
1. Enemy attempt moving out of my reach, triggering an AOO
2. Cast Booming Blade via War Caster, hitting it and sheathing it in booming energy
3. Sanctuary drops
4. The enemy either keep moving and take damage from Booming Blade or stay within 5 feet of me and attack me
I can buy that he does not have to complete his move, but he has still moved to the edge of my reach (5 feet), that uses 5 feet of movement and put him in a different location than he started his turn.
If we are to take this logic and apply it to a reach weapon - if an enemy tries to move away when I have a pole arm and I hit him with an AOO from 10 feet away does that mean he never moved at all and is still standing right next to me? To pull this thread a little more, if I do this with Sentinel and he can't move any more after I hit with my polearm, does that mean he can attack me if he has only a 5 foot reach?
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