I have a few questions : mouthpiece gate and Silva not capitalizing on front kick

First of all, it was an entertaining fight, and 40% Silva did well for his age.

However, i want to ask you sherbrahs what is the rule concerning the mouthpiece loss? If you lose your mouthpiece and there is no action, does the ref have to stop the fight for a moment and give it back to him straight away? Is it Herb's fault for letting it go on or Bisping for wanting his protection back? I thought the mouthpiece was a basic and obligatory protection...

Then the other question is more a wtf...

I have a few questions : mouthpiece gate and Silva not capitalizing on front kick