The new students have not started to compete in tournament yet but the advanced students have.
Here is a Chinese wrestler teacher taught his advance students how to use illegal techniques to injury their opponents in tournament. It's in Chinese but you can understand by watching the teacher's action in the clip.
1. Put pressure on opponent's wrist joint.
2. Pull opponent's face into your elbow.
3. Put metal edge under shoes.
I don't see anything dirty about 1 & 2 in context to the early UFC's as these were all legal. Elbows to the face and wrist holds are still legal.
3, is just bringing in a weapon. I would think that in KF tourneys, they would check for it. I guess this little guy trains KF.
Early UFC's basically had zero disqualifying rules, which pretty much dispelled and answered all myths about that "street fight to the death" boogeyman.