We worked on the ground mobility cycle for a while next, then went into a review of escapes from the mount, with an emphasis on framing an arm under top guy after bridging, and moving hips to the opposite side as the leg you're trying to free up.
Next we worked on escapes from kamishiho (north-south). First up was the Bridge & Roll (trap one arm, put feet to the opposite side, and bridge over the shoulder on the same side you're trapping). Next was the "Spinout". In this one, you grab one of top guy's legs, throw your feet to the other side, then throw them back forcibly in the other direction while using your grabbing arm to help you spin out. This tends to put you under his side control (which may be easier to escape from), or enable you to put him in your guard. Lastly, the double bridge & roll. If you're setting up for a spinout escape (throwing your legs to the first side), and top guy readjusts to hold you better, when you throw your legs back and find the spinout hasn't worked, you can immediately bridge for a good escape. In this case, his defense against the spinout has set him up well for the bridge & roll.
A couple things I observed that I need to keep in mind: 1) Keep my own arms out of my way during escapes. 2) Learn to frame better when being held by kamishiho. Particularly, point my fingers toward my feet rather than my head - that'll keep my wrists from being bent back and sprained.