Say what you will about Jack and Heracles being evil and good respectively. But you still have to admit, Jack is probably the most realistic fighter out of all the humans we've seen. Humans have never fought fairly, they always use deception, tricks, and the very environment they fight in to fight and emerge victorious. Props to Jack for embodying the true spirit of humanity's way of fighting, surviving, and dominating the world over thousands of years: pure cowardice. A coward might run and hide but they'll survive, learn, and come back to finish what they couldn't do if they get the means to.