If Wrench wasn't a gremlin, he'd have just pulled out his own pad of paper and communicated that way, but the way he sees it it's not his problem if people can't understand him. That's their issue. Still, it does seem that will end up being the way things go.

He will roll his eyes when Malcom speaks slower. Plucking up the pen he'll write.

don't do that just speak at me
fine I guess