modular_nova/modules/self_destruct_sequence/code/self_destruct_cinematic.dm

/datum/cinematic/nuke/self_destruct/persistent	The stock cinematic hangs its backdrop on the mob and only re-shows on that mob logging back in, so anyone the nuke gibs loses the screen the moment they land in an observer. Which, at the end of a self-destruct, is everybody. This one follows the client into whatever body it ends up in.