In the epilogue of H2A, Locke says the UNSC wants Chief back. Yet in the Locke’s trailer, he plans on killing Chief. What do you think happens that causes Locke to go from trying to return Chief to trying to kill him?
I wouldn’t draw too many conclusions from the Live Action trailers, with the exception of the Halo: Reach trailer they aren’t very canonical.
The live action trailers have meant to be hype us.
I think the trailer in Halo 5 takes place before Chief blows up/ dosn’t stop the city.