Well tonight I tried feeding for the first time. Didn't go so good

First when I went to put the mouse into the "Dry Ice" Chamber he bit my finger

Then I tried offering the recently deceased to my Ball and he wants no part of it?? He acts scared of it or something? Maybe he just doesn't want to eat or am I doing something wrong? When should I try again? How long before the dead mouse goes bad? I'm discourages guys & gals