Yes, I was wondering if it is perhaps a female getting ready to start laying. The submissive squat would be appropriate in that case.Chickens can be real brutes to each other. I had a severe case of bullying once and I ended up having to rehome the bullied hen. Whatever the problem was I couldn't stop it. She settled into her new home and was very happy. Are you sure your chicken is a male? I've ever seen a male squat before. It probably does happen just I've never seen it.
Regardless, probably keeping the chicken isolated for a while so it can regain strength and confidence would be a good idea.