Re: Can cats 'fake' injury?
Yes, I think they can. My housemate's cat had a gig going where, whenever you put the harness on her, she crept around the house like a poor, crippled kitty. The harness was fitted properly and not pinching, and she showed no other signs of discomfort. I'm pretty sure it was all an act. (It worked, too.)
And you should see how Misty runs about on three legs with her "injured" paw clutched to her body when I rub hairball remedy on her leg!
On the other hand, it could be the cat equivalent of a stubbed toe: it hurts, maybe you limp around for a few minutes, then it feels better and you stop limping. So it could be that whatever it was was just a minor injury that hurt for a few minutes and then felt better.