Wow, this is absolutely the worst MMA promotion ever. The ref has absolutely no control. Let's count the mistakes:
.05: The cage door falls open. It doesn't even appear to be locked.
.30: The ref attempts to stand the fight up as soon as it hits the mat.
.33: Guy on top headbutts opponent
.35: The guy on top keeps punching, aiming around the ref's arm and body.
.48: Ref manages to wrestle the guy off the top and restrain him against the cage, at which point his opponent runs in for an overhand right over the ref's shoulder.
.52: This prompts the restrained fighter's coach to enter the cage through the unlocked door, trip takedown the opponent, achieve full mount and commence ground and pound. YES, THIS IS THE COACH WINNING THE FIGHT!
1.10: Now there is a riot outside the ring, Diaz-style.
1.42: Now someone has thrown a towel into the ring.
1.54: Somehow, the fighter whose coach beat up the other fighter is now declared the winner.
2.08: The losing fighter tries to climb over the cage for Round 2 against the rival coach.
2.28: The fighters hug it out
CONCLUSION: Nobody involved in this should ever be allowed near an MMA cage ever again.