“this squirrel’s behavior does not sound normal”
Being stuck in a human structure is not a normal situation for a squirrel, so you shouldn’t expect normal behavior. A wild animal in that situation is going to be very scared and defensive, and squirrels are naturally very jumpy and high strung anyway, so if you get them scared in a strange place, they go (pardon the pun) a bit nuts.
Okay, makes sense. Thanks.