2 Part Technique - If it can't finish everyone, it's not a submission. Marcelo doesn't use the Arm-In Guillotine because he doesn't believe it is a high percentage finish against larger, stronger opponents. The position is effective however, when used to control your opponent's head and arm, as in the case of the Front Headlock from Half Guard. Use the control to pass your opponent's half guard by kicking yourself free and preventing his farside arm from causing problems while you hold him down in Side Control. If he turtles in spite of having his arm checked, take his back from the Front Headlock with the Seatbelt.