https://howtheyplay.com/individual-sports/The-Loop-Choke
A hand in the collar raises the defensive hackles of virtually every jiu jitsu practitioner. This almost always means that the second hand is soon on its way to finish the cross choke or some very similar variation. Fear not: there's a sneakier move you can do that will first set your opponent at ease, and then bring the shadows of night in from the outside, with a quickness. Enter the loop choke.