Apologies, worded it horrifically.
The way the knee bent into valgus (knee going in, while foot going out) - could easily “sprain” the medial collateral ligament - which could be at least 4 weeks out.
Hopefully it was a simple jarring of the knee, but I always wince when I see that sort of unnatural knee bend.
Edit: Just read the most recent posts and now seen Ten Hagg’s comments so it looks like I may be right in terms of what may be injured.
For what it’s worth, I’m a doctor with a sports medicine degree so I thought I’d put my two cents in there.