The Aoki lock is a devastating leg attack. Looks like a straight ankle lock, acts more like a heel hook. This clip is from a seminar I taught on combining guard passing and leg attacks at @griffonrawl_combat_sports and this particular sequence is a stomp leg drag to saddle entry from top. We looked at several saddle submissions, but this Aoki lock is my favorite, I believe. The full seminar is coming this week to Patreon.com/KnightJiuJitsu