Leaving a trail of carnage and corpses is not the way of the surgically precise contract killer. Therefore covering up your dirty deeds is something that should come natural to you. If you fail to do so, bodies might be found before you have vacated the target location and will thus attract unwanted attention from strangers. Dragging disguarded obstacles into broom cupboards
or corners will prove very effective in keeping your path, if not clean then maybe somewhat obscure.