You can. If it connects. But if won't - you'll lose. I managed to kill all other supers within melee range, but not reliably. Sentinels duel may be most hilarious infighting I ever saw, because you either staggered, or just fly through each other. Recently chased one hunter together with another sentinel, and I never laughed so much, because we just couldn't hit him at all. As Diablo 2 smiter I find this sentinels treatment most offensive. :)