I have to disagree with electric chair being dangerous or putting pressure on your knee. I've never felt any pressure anywhere except on my groin. Never tap'd because i can almost do the splits. So maybe that is why i never feel any pressure on my knee or w/e. By the way i've had my ACL repaired and still feel nothing when in this submission and i've been put in it by Eddie himself. I wish we had another angle on the video, because it looks like the guy had his leg on the shoulder bent back and maybe got it rollled on. At that angle that would do some dmg to the knee, but the actual submission itself is harmless i think.