BTW.... to answer your question, this is safer then mexican carry.......(IMO)...... yes, the muzzle is pointing at the guy for a far greater period of time then a traditional draw, so if there is an AD during the draw or reholster, he will get shot in the vitals.
The trigger is however covered when secured in the holster, and the only possible way for there to be an AD is if the trigger is depressed..... if he follows all the safety rules and keeps his booger picker off the trigger there will technically be no problem......
THERE IS NO POSSIBLE WAY (except spontaneous combustion)
FOR A GLOCK TO DISCHARGE WITHOUT DEPRESSING THE TRIGGER..... Oh, there is a Plaxico joke in here somewhere.....