Animated enemies.

In words:
A tile showing a monster/(other thing that might move and hurt) that can move around and serve as a hurt-event.
Animated sorta like this:

1.Sprite-Empty-Empty-Empty
2.Empty-Sprite-Empty-Empty
3.Empty-Empty-Sprite-Empty
4.Empty-Empty-Empty-Sprite

You can of course give the thingy a smoother animation or so,but it works fine like above!^^