What Stays Behind

I killed a small animal last night. There I was, dreaming away, and the small animal was at the screen. Apprehensive, I watched as it almost instantly passed through the mesh and on my bed. I knew it would cause havoc. It looked to be a rodent of some sort, brownish colored. Keeping my eyes on the thing, I felt around and found my glass cup from work and whisked the creature inside. Now what? The situation couldn't last -- I didn't have anything to keep it in there. So I somehow picked up a hammer and somewhat reluctantly mashed it down with the handle, causing it to become a sort of furry round pancake. There was no blood, no gore, no sound of suffering. When I woke up, it continued to bug me. At work, it bugged me. You'd think I'd be more bugged by some of the high crimes I've committed in dreams -- murder, lust, thievery, sharp dealing -- but this is the one that got to me.