I'm all for pulling guard but I feel you really should have to bring the guy down with you if you're gonna do it. It's almost unfair that Hall just plops down and Hermes is forced to engage him. I agree that you aren't allowed to disengage, as in stand back up once it's already on the mat, but you shouldn't be forced to engage a guard player at the start of a match if he plops down, he should have to jump closed guard or get some solid control and bring you down into his open guard. Or you take 2 points away from the guy who sits on his butt and then make the other guy engage.
Don't most BJJ comps require you to get grips before you pull guard?