Make the first alien you fight ungrabbable
Imagine: The first alien you face! It leaps and bounds across the terrain, going high and low, and dodging and weaving around your bullets! It leaps towards you, hitting your armour with its metallic arms! You manage to hit it with 3 SMG bullets while frantically navigating the wreckage, craters, etc. It jumps to the highest point, and you follow! It leaps off to the very bottom, and you leap with it, firing your SMG one-handed as you drop through the air! You hit the ground and stagger, and the alien draws near to finish you off! In a last-ditch effort you POWER-MELEE! A strike so powerful, it drains all remaining energy and requires use of your left fist instead of your weapon, for fear of snapping the firearm in two! The alien crumples into a wall, sparks and blood flying out! You pant in exhaustion at the epicness.
Currently: The first alien you face! It leaps and bounds across the terrain, going high and low, and dodging and weaving around your bullets! It leaps towards you, hitting your armour with its metallic arms! You press F, grab it, then throw it. It dies.
All Crytek need to do is tick a box for that one alien, if CE3 is even slightly similar to CE2.