My rabbit is virtually fearless. He does not run from cats or running cars, showing curiosity instead. (The one time he got up close and sniffed a cat, he did become startled and put a couple meters of distance from it. And he does hop away from moving cars, but not as fast as he could.)
Issues of outdoor protection aside, my question is about the physiology of trancing. (I've only done this to check his teeth, by the way.)
When he's upside-down, he'll kick for a couple seconds before he rolls his eyes and passes out. After I put him back, he seems none the worse for wear. He goes right back to his usual friendly self. I thought this was normal until I saw "Can trancing a rabbit have cumulative negative effects?":
The immediate side-effects of coming out of TI include things like increased respiration, heart rate, and plasma corticosterone (a steroid found in many animals).
the response after release is to escape and hide which, after all, is the purpose of TI in the first place
My bunny is certainly uncomfortable with being upside-down, but seemingly no more than if he's picked up awkwardly. As for the rest, he just gets really sluggish. Is this unusual? It seems to conflict with the common explanation of tonic immobility.