I've had one time where I thought one was about to get up from under me. It was the 9th hog and final hog of the night last summer and I was beat, dogg tired. I crawled off into the thicket and grabbed leg didn't have room to get it flipped so I just layed my chest on his butt while I got some ties on his front legs. He couldn't do nothing as I am a heavy load to walk off with. Or so I thought.
Turned out ok, just jerked the ropes on his front legs and they flipped him so I could get to sittin right on him.
I usually take the front bottom leg and hold it up past their pecker, they ain't usually goin nowhere.
Thats exactly what i do and place 1 knee behind the ear and 1 right before the hind leg and rarely have a problem.
"the sun is shining somewhere in texas" -Jason Boland