Yeah I'm not sure you'd even bother with bullet time for this. There are other mechanics you could try like him raising his suit jacket to block bullets makes him weak to hand to hand attacks or getting grabbed and using hand to hand makes him more vulnerable to ranged weapons so you'd have to keep bouncing between the two if the level design put you in tight spaces with multiple entrances for enemies to flank you. Could have a third mode for melee weapons for some rock-paper-scissors action