there is 1 wall on that part that cant be destroyed so just hide behind that and when he trhows grenades just run

U need to find a missle launcher on the left supply box then push LB and RB then he has
missles now find a sniper rifle push RB and LB Until u c a Blue Health meterThen shoot
then keep doing itUntil u desroy him.P.s.theirs two missles on the robot

Make u sure u enter the area with a crossbow.Hide behind the broken pillar near the
entrance and press L and R at the same time a blue bar wil appear above of the chain
gun.Destroy it first only move away wen missiles are fired.Wen the chain gun is destroyed
attack the missile launchers by moving left and right evading missiles and pressing L and
R to lock on it.Wen your crossbow is empty get the rocket launcher followed by the sniper
rifle just lock on him until he is destroyed