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This is easiest way to make him fall and super cheesy:
If you lock on to him as soon as you finish going up the ladder and shoot 5 times with a pistol, he will fall. Works 9 times out of 10. Then just reload the game there to get his drop to spawn on the ledge.

He's actually optional and you aren't meant to fight him early on, since he can become a friendly NPC later on, that's why they made him soo hard.
Also, you can just rush his tower without killing any enemies by jumping off the building where he first starts shooting you, roll to a statue to not get shot, then continue run till you're out of his line of fire and continue with the level.