Make shamblers suck less

[Berrik]

I started a fight in medbay as a shambler. I spat and stung in every direction and even tried to disarm, but I got set on fire, splashed with all sorts of horrible chems (including mutagen) and slowly got dragged to the reclaimer despite anything I could do to anyone. Not being able to eat people because of hats didn't help any.

One really obnoxious thing is that the shambler's special disarm (ripping a limb off) doesn't hit real often.