>>538384803
Either
>you refuse to work with them when Reed meets Myers at the hideout
>you let the cameras detect you during that tunnel segment, chose not to delete the recordings then when you come back with Reed and see the barghest raiding the place, you run away instead of helping
Also if you run away in the MaxTac mission Reed will fight them off alone and gets killed. This is probably the only way both Reed and Songbird die.