negotiating self-defense
B is likely in a poor negotiating position to start with, and better off just giving A the wallet or running. A's strong position comes from the precommittment strategy of poor impulse control: "I don't care if you can get me in trouble, I'm too involved in this attack to think beyond the next few minutes".
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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