well if you want to have a chance at defeating that boss with butcher knives you should get the candle thingy that reduces their spike by 1 so that each attack you deal he spikes only once, also stopwatch isn't really that useful, in my days of playing this I realized that the best item is the belt of knives when using butcher knives because it gives 3 attacks to multiple weapons, for me stop watch is just an indicator of what butcher knife procs the most so that when i get my blacksmith to give rage to one of my butcher knives i do it to the one who procs the most
but no your gonna fail no matter what