What happens if there is powder in the barrel and just needs that little puff of air to go off.????and you have the barrel in your mouth !!!!
Flask to muzzle loading,get you thrown off the firing line in some parts and band in some others.
If you do it and nothing bad happens,"No blood,NO foul..however if it goes bad,Lots of both,,Blood and Fouling all over the range and people around you,not the way to scare people,with your body parts scattered around.
We start life with an empty bucket of experience and one full of luck,the idea is to fill one before we empty the other.