This is an armbar with a bicep slicer variation. With the figure 4 (kimura grip) you must push the opponents wrist down with one hand and pull your other arm back so that your wrist is cutting the opponents bicep.
Keenan Cornelius shows his version of the cross choke from the mount.
Details for finishing the armbar from mount position by turning the opponents head away from you and choking the opponent with their own collar.
Ezekiel Choke from the mount with 4 fingers in the sleeve. It’s important to put your choking arm across the opponents throat until you sleeve is tight against the side of the neck.