LOL. I just realized that I didn't do anything from last week's lesson about staying in the mount.

I also meant to try the diagonal stabilization in mount, where you grab the opponent's arm between his shoulder and elbow, then grab around his knee/thigh area on the opposite side. Pulling up on both will help to limit the opponent's ability to roll you. So I've heard, anyway.
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"In case you ever wondered what it's like to be knocked out, it's like waking up from a nightmare only to discover it wasn't a dream." -Forrest Griffin