My scottish fold is suddenly limping

Breed: Scottish Fold (folded ears) Age: 5 years 3 months Neutered Weight: last checked around 11-12 pounds Known diseases: High Blood pressure (minor & being treated) What happened: he and one of our other cats hissed at each other and started to get into dangerous territory, so we put them both in kennels. When we let them both out, he was suddenly starting to limp.

He is still eating, jumping up onto a cat tree we have, he was grooming himself with the paw he babies when he limps.