I recall watching one of the twitch feeds where they showed recording a game, and it appeared that what it did was record everything that went on, and when you played back you could sort of free spectate the playback. If that is where their experiment ends up, then hopefully they will have a way to have a limited buffer of recording, and when a player is killed it simply plays it back with the ability to automate a camera to follow the view of the player that made the kill. Dunno, just thinking out loud.