For once, running around like an empty-minded moron with a butterfly knife actually helped.
I was just flailing my knife around as Infiltrator and actually backstabbed the boss.
I feel there are too many Infiltrators now-a-days. Too little of them ever use the Sixshooter, they just run around trying to backstab the boss. Not saying that's bad, it just hurts your team. Because of this, everyone dreads a Rocketman because if one is there all Infiltrators don't to anything but complain about how they cannot hit him because the Rocketman keeps launching him away.