Started digging up Jeff Glover footage. Found two of his matches in Nevertap where he's playing half guard. Grabbed some screenshots of the moments that interested me.
From his first match with John Ramirez.
The match starts with some hand fighting from standing. Jeff pulls half guard. Ramirez tries for head and arm and gets heavy. Jeff keeps sticking his hand in the armpit and gets the underhook when Ramirez tries to reach back. He gets deep using the swinging motion of his hips (like in the clips above), rocking back and forth a couple times and ducking his head to their hips.
He's slide way down the trapped leg and put in a butterfly hook. He has an underhook and the other arm reaching through the legs.
Ramirez ties to sit towards Jeff head and messes with the underhooking arm and his feet. You can see Jeff's other hand coming up through the legs and grabbing the back. Jeff's head is resting on their thigh and he's got the trapped leg elevated.
With their weight back because they're sitting, Jeff spins around their leg to come on top.