Now, on the whole, I think it's a good thing to have cats that hunt mice and other things. BUT, I've also noticed that cats learn how to hunt from their mamas (or other, older cats). Since these two came to us as very young kittens, hand-raised in the shelter, they don't have an older, wiser cat to teach them how to dispatch their prey.
I finally picked up the mouse in a paper towel and took it outside and dumped it. Hera sniffed all around the living room wherever it had been for a long time, thinking that it must still be around there somewhere.
This can't go on.