Would that move against Swede really have worked?
I get that Gunny had control over swede's arm, but wasn't he strong enough to just pull out of it, or kick at Gunny's legs, or use his other hand to release Gunny's grip on his elbow?
I'm sure it takes practice to perfect that move, don't get me wrong, but is it really that "easy" to incapacitate someone twice your size once you know that elbow-bend move?