unstable when I do things like back pedaling. Did a hard cut when diving for a ball. Felt what might have been a small pop with no immediate pain but a few minutes later I was backpedaling and my knee just gave way and all the sudden I was sitting on the ground. I can walk without pain 30 min later but my knee is stiff and I can’t bend it past about 90 degrees. I’m calling a bro in law who is a doctor and getting his opinion too, just curious if this sounds obviously like an ACL or something similar to those of you in the know.