Braum's passive does bonus magic damage once the stacks are complete, right? So if another character procs his passive damage, and that bonus damage kills the enemy, who gets the kill?
I haven't played Braum, but if I had to warrant a guess...
Probably the person who popped the stacks.
I'd imagine that person's mpen also factors into the stack-popping.
That's how it works with Leo's passive, so...
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