Yeah, Gordon's stiff because I suck at animating. I don't really know how to make him appear more alive, so I did what I could to make him at least seem like he's breathing and maybe shifting his weight a bit.
The model is some Freeman model taken off the workshop with all its bones shrunken down to nothing, then matched up and placed inside the body of a scientist whose head has been shrunken down to nothing as well. The Survivor model looks pretty good and I'd switch over to it, if not for the bad-looking HEV suit and the fact that he still has a tie, which canonically Ross's Freeman isn't wearing.
After making this thirty-second animation, I wholly concur with this statement.