Back then the fight world knew very little about jiu jitsu. In fact I never heard of it until my older brother told me he was being trained in JJ for the Army. He demonstrated a few moves on me and I saw how powerful these moves could be in a real fight, knowing most fights end up on the ground. I don't think the ref was aware of BJJ or what to look for.
Eeny, meeny, miny, dead
Catch a ninja by his head
If he hollers kick him back,
Then remove his still beating heart and watch him die slowly and painfully.