This applies to humans as well, again we are animals and have things such as adrenaline rushes.
1st of all no, animals do not fight to the death. They fight to survive. The only animals who have fought to the "death" are hypercarnivores like tigers who's entirely life depends on killing it's target. Gorillas are herbivores and passive, again I don't get why you think Gorillas are aggressive when they are not, you are watching too many King Kong vs Godzilla movies.
There are literally videos in this thread of hippos, one of the most deadliest animals attempting to run away from a pack of lions. Animals are not stupid, they unlike you understand the numbers game.
And again yes, humans are literally wired to kill if we have to. We are the deadliest creature for a reason
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killing an animal with a group of people is probably easier than trying to beat a pro female fighter lol. Have you seen the way some guys throw punches?