I have a new snake and i fed him a f/t fuzzy. he lunged, grabbed it and balled up to constrict it. does this mean he was fed live previous to me? or do they do this no matter what. My bf was trying to tell me thats why he constricted it, that if he was raised eating f/t mice he would eat it normal like a garter just swallows a worm etc. is this true? TY