Ok, here are some advice to prevent you from passing out by any chokes:
- Always try to relax and make your neck long. You should always wait for them to get it nice and deep before you start to defend it.
- Try to get the molars to line up and tuck your tongue in(imagine the way a turtle hides it's head). Your tongue is pushing on the bottom teeth outward and this for some reason gives you breathing/damage room to finally escape. When you escape.. it's slow so, don't burn any real energy and don't make a choke tighter.