You don't seem to listen at all.
CO2 IS NOT INSTANT.
It actually takes longer for the animal to die in a CO2 chamber than it does during the constriction process.
Also, not all frozen mice and rats are killed with CO2.. some have their necks broken.. Especially the ones you get from Petco/Petsmart and not direct businesses. Just keep that in mind.
Also, you guys are going by your "feelings" and what "seems" to be. And that's nice and all.. but we're going by science and real evidence based on the cranial structure of a reptile and what their brain is capable of understanding.