just pulled off a sick upside down head arm triangle from back mount the other day. guy said it was so tight he was about to b out in seconds
from top position on there back with hooks in, swing one leg out an around to same side of body as if you are about to lay on your back next to guy with one hook in, your arm goes around his neck deep and comes out under his armpit, grab with other arm and sit back to lock in neckchoke crank,,, also your one leg you left in is to keep them from flipping forward to get out of it