A perfect example of why you ALWAYS make sure your holster is clear of things that can snag said trigger as the gun is inserted. This is especially important if you wear your firearm under things like baggy clothing, sport coats, etc.
Better yet, put the gun in the holster THEN clip the holster to your belt.
And, as always, NEVER POINT THE MUZZLE AT ANYTHING YOU DON'T INTEND TO DESTROY!! (Your own butt, your fellow officer't foot, etc., etc....)
Brad