Have you guys noticed that during the campaign NOBLE team was kind of being hunted down? Like when Kat got sniped. The covenant started burning the city to draw out NOBLE team. And I found it very odd that there was a big hole on top of that building noble team passed through but not much else of the building had taken that much damage and a phantom which seemed to just be waiting for them. And the zealots who landed on the mass driver platform to kill Emile. They could've just blasted the Mass driver but you know elites. When they want to kill someone they'll kill them with their swords. One way to back this up on who exactly was hunting them down was that field marshall who escaped and blew right past emile in Winter Contingency. All the other zealots stayed and were killed by six and jorge. So after retrieving the data the field marshall must have initiated an op to find and kill the spartans just like in the flood. It might not be true but something that really suggested it was Kat's death and how that phantom was just waiting for them. But for some reason when six went and knelt beside her they didnt try to shoot six so thats kinda dumb.