It could of been terrified of its new environment. When i fed a black male adult mouse the other day.. made me feel bad. I just basically "switched for the time being to live" just recently and well the black male mouse would sniff Chester my Bp, then go back in the corner (which is inches away) and do a tail twitchy thing, and sprays. I think some mice and rats do know whats comming for them and others do not.