Yesterday playing CO I decided to get GL nice and early so I rushed. During this game I twice hit skulks point blank with the gl and suffered no damage to my own armour.

Its extremly hard to reproduce and I just seemed to be on extra twitch mode that day but the skulk MUST be in the air from what I remember. You can't just lay gernades on the ground and wait for the skulk to die. Twice I hit a skulk in mid flight before he got a bite into me and I suffered no damaged to myself (100 health 25 armour).

Seemingly the gernade explosion is being absorbed by the skulk and not blasting onto the marine.

or maybe the grenade explosion code or whatever, since its on a different level and hitting something doesnt want to hurt you.

doubt my reasoning though.

Skulks can bite right through you (doing no damage) if they're close enough. I am guessing it's the same bug.