Mounted Triangle Choke
A triangle choke entered from side mount by lifting the opponent's shoulder with a wrist pin and armpit grip, then entangling the leg to lock the triangle. It works by using the hamstring to cut off blood flow when the knee is driven deep.
4 steps
· save to drill into each- 1Pin the opponent's wrist to the mat with one hand while reaching behind their head with the other to grip the opposite armpit.1:55
- 2Lift the opponent's shoulder by leaning your body weight into the armpit grip, then drive your knee high behind their head.2:30
- 3Rotate your hips and foot so your leg goes under their arm, then step your shin over the top of their head.3:10
- 4Drive your knee deep into their chest/neck area and scoop your hamstring back across their neck.4:00
Source video

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Then the round started — and you forgot it.