Securely tie a stick across the fork in the shrub, creating a small triangle roughly one-square-inch in size. It needs to be small to act as a choke point. You'll also have to do some planning with the length of your snare and the engine, making sure you get through the fork and all the way to the ground, without having excess line. You'll want to tie the cross stick on the side of the fork that the animal would be coming from, not the side where the engine is located. Tie your snare line to the engine as normal, fish the noose through the triangle you made, and set the snare as normal. When the trap goes off, the constrictor triangle will allow the snare noose to cinch much tighter than it normally would, and choke out your game much more quickly. Hopefully, if the animal's neck (or torso) happen to be in the snare loop, the trap knocks them out in record time. Alternatively, skip the triangle construction, run your snare noose under an exposed tree root on the ground, and set the trap as you normally would.