The easy way to defeat that mutant guy. First before the mission stock up all your ammo and have the blisk harming upgrade for your meteor wepon and the zap-o-matic or desinigrator ray. Then when facing him use your zap-o-matic / desinigrator ray on his armour (if not he will recharge his health). Then when you posetive all of his armour is gone go near him and use your meteor gun (if you are far away he will be able to run from the meteors)then peg it with your jet pack. Then repeat, if you run out of ammo then use the Ion detonator then he will be swiss cheese!