In such a situation, how many people can insist on living? When he finds the gun, I think it is good to choose suicide. But maybe what the movie wants to express is that people still want to live after all, although it is an instinct to not know who they are.
But under the temptation of "survival", he still revealed his human nature. At first, when he bit the lion (not sure if it was a tiger, a bear or a lion), he devoured the carcass in the distance, but he shot to stop it. But then he took the initiative to throw a corpse at the lion. Well, sure, he was right.
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