[Post-Revamp] What would you do for a Bandit build?

Well, I guess we're both wrong, because it's certainly not doing 1300% damage of what it took. Do the math.

At one point he takes 861 damage and the mirror reflects 27963.

It's also possible he didn't max it. Or there is a damage variance. Point being it is approximately 13 times the amount of damage you take.

EDIT: Yeah, you're right. He definitely maxed it.