Just as a For Your Information item.......
many British rabbit rescues and societies do not recommend Bunny Trancing. They feel it is stressful for the rabbit to have his tummy exposed, where a predator could easily rip it out. Too most rabbits come out of a trance very suddenly....as if they are frightened and they could hurt themselves trying to get right side up and away from you.

I'm not saying I completly agree with this view but it does make some sense.