I am not saying he is hurt at all but you can walk around fine on a torn ACL
Yep, in fact, you can run full speed ahead just fine, it's the planting and cutting that is the issue. Back in the day, small town HS kids used to play weeks with them before they got around to seeing a Dr or the traveling athletic trainer got to their town. Once, when I was coaching HS basketball, I had a kid tear his ACL in football and played all basketball season with it braced up.