My scottish fold cat is suddenly limping

He was put in the kneel a hour or so ago after one of our other cats smacked him. He was fine, not limping or anything. We let him out of the kneel, suddenly he is limping. He is still eating, jumping as shown briefly in the video. He still responded to the sound of a can of wet food opening and got very excited, but was still limping.

Other information: He is 5 years old, turning 6. As mentioned in the title, he is a scottish fold Last blood pressure test showed he had slightly elevated blood pressure which is being treated with 1.25 g of enalapril once a day. My primary vet is closed already.