A: I want to take your purse.
B: If you take my purse, I will kill you.
If A continues to try and take the purse, A is obviously the agitator.
A: I want to leave you.
B: If you leave, I will kill you.
We agree B is a monster here, and this is a police matter, not global politics.
Maybe we can create a better example...
A: Hey B I want to nail your cousin.
B: I will not allow that to happen. Bro I will ruin your world. Literally, armageddon. Don't do it.
If A continues trying to nail the cousin, clearly the agitator.. no?