What? No!

You can't go around dropping ceilings on people, that's not classy enough for a proper assassins guild. Clearly what the Operative needs is a shark pit. Of course, what with various denizens of the Nexus near universally being able to avoid or outright a garden variety, it would have to be a flying, adamantine-toothed god-shark, but there's no price too high for true style.