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First time I tried this I had my normal set of weapons, and then it was no big problem (just a small one). I decided to do it without armor, as I was suppose to make that video anyway, and it was a good kick of adrenaline.
It's a lot easier to kill him in the jungle - so enrage mechanic work. It's a lot better than him one shotting you - like other bosses do when timer runs out.