Not sure snakes have fear...more instint. Its already been stated constiction doesn't usually occur round the neck, hences davo saying about rubbing a mouse on his neck,
Alright... I am not sure why you quoted me on this. Are you trying to rebuttle or anything? But really, in order to get constricted around the neck, you have to be really dumb. Unfortunately it had happened on forums like RedTailBoas and Kingsnake, but in all the cases it's because the person bent over with them around the neck without supporting the snake and the snake started to slide off.