It's important to establish that there's a not so subtle difference between Situational Awareness and Tactical Awareness. Situational Awareness implies the assimilation of area wide information consisting of multiple bandits, friendlies, their relative E states, projected vectors and likely intentions on an ongoing basis. Then using that information to formulate a dynamic action plan for working the entire engagement.
Tactical Awareness is the diligent scrutiny of a single opponent's moves, behaviors and likely intentions in order to decide the proper counter-maneuvers to deal with him specifically, in hermetic isolation, as efficiently as possible. Tactical Awareness is always required in any engagement, situational awareness is not.
Never losing sight of a bandit after the merge, watching him in order to decide how to best counter his merge move is an example of tactical awareness.
Keeping a vigilant eye on the bandit above you who you suspect may be coming in for a gun pass on you just as you are about to go to guns on his buddy you've been working is an example of situational awareness.