Ron White: "You ever take a crap so big that your pants fit better?" 
I'm sure there was enough gas in there to send a diesel-powered semi-truck a couple of hundred miles down the road. But as it happened out on the desolate steppes of southern Russia, no harm done.
I'm sure it was steady and uninterrupted for at least three minutes, maybe even more.
And yes, my middle had shrunk considerably when I was done.
I've since wondered why cattle who eat too-green alfalfa never developed this technique; if one's full of intestinal gas, it's probably a good idea to blow it out.
In private, of course.