"Tuxedoed Tormenter"
Oh lala, Ms Ritzy...you are really scaring to the mousies!!!

Your story is so familiar to me...that's exactly how Nellie reacts when she catches a mouse outside...she has never learned to kill them...they are just fun...(oh how cruel! )...

But sometimes the mousies manage to escape and then Nellie would wait patiently in front of the spot...seconds pass...then minutes...but after a while she's fed up with waiting and she goes away for some more mice hunting...
In the past it happened more and more that we suddenly spot ALIVE mice under our furniture...so I guess word spread among the mice to keep still until Nellie is giving up waiting...
I wish she would be more thoroughly regarding her "toys"...