There are always bag monsters in our house too but our bag monsters never attack. The girls drag the bag around with them and don't seem to care at all. Lilith is usually the one that gets her big butt in the handle and she will walk away dragging it with her then Vixen will hear the rustle of the bag and attack it from behind. They will play like that for awhile until one or the other kills the bag monster and then they go on their merry way leaving me to clean up the carnage they have left behind.