My opponent didnt guard jump really. I shot a single leg takedown. He sprawled. I had an underhook so I punched it high to squat up. My goal was to create space underneath to follow up with a duck under out the other side. He did a tani otoshi while I was still basically in a lunge position and squatting up. My knee collapsed underneath me in much the same way. The injury was the same, but he was NOT recklessly jump guarding. The issue is that the tani otoshi is safe when the opponent is on his knees or on his feet… but it is dangerous AF ANYWHERE in between.