[@SolasReveal]
Yes, of course. The monster-man is quite disregarding of human lives and existences due to a wholly alien mindset, but he is still not suicidal and posesses a sort of morality, even if it is not of the usual kind. He will cooperate eagerly and might even form bonds with others since at very least they are friendly to him and are in the same sort of predicament. I'm thinking that his power would be turning into an actual scary, supermurdery, highly celeritous and nigh-invisible beast - as long as nobody focuses his sight on him for enough time to see that actually it is just a person. 

Alternate variants are EXTREMELY PRECISE (meaning cellular level) mid-range telekinesis which can at most lift 10 grams or the ability to manipulate, slow down, stop or speed up any sort of harmonic motions within a certain range - from pendulums to heartbeats to sound vibrations to electromagnetic waves.