My lad was watching Myth Busters at the weekend and they where testing a myth re a propane gas cyl turning into rocket and it firing up 150 ft, they put the full propane cyl in a fire and it just released the gas through the safety blow off, then they blocked the relief and tried again the cyl vert went ball shaped before it burst.
Point of this is the next thing was they showed one of the presenters Tori cutting straight through, and cutting the cyl in half, with a grinder !!! valve still in place !!!
I thought at the time that is a VERY good example to show to all the world !!
so I complained to them I hav'nt received a reply yet.
Did they do any shots of her bending down while cutting it like they normally do?