When you finish with some battle and move your characters away from that place, then command them to run back to it - but pull the camera to it before they actually come back there, you can see various magic effects firing off over that place of battle, as if someone was still alive there. Its mostly healing spells animations and effect that appear in the thin air above all the dead and any environmental effects still left - although some other can be seen too.
This happens with every battle or fight location, especially any larger ones with more enemy remains left.
