What was he doing before he turned his attention to her? "His attention" presumably would not have involved turning his head to look at the big fat helmet on her head from the side. (Such would only have been a further waste of precious time.)
He should have been commanding, "My control!" or whatever their agree-upon verbiage to that effect was.
WO Evans had been working the radio (with the controller), so he should have been visually scanning for the CRJ. His awareness that Capt. Lobach hadn't turned left nor descended to be within the limits of Route 1 should have already been at the top of this thinking.
I find it difficult to imagine there was an redirection of his attention, as if he looked up from where he'd fictionally dropped a picture of his wife (Sum of All Fears reference).
She was not aviating (without mistakes). Unless Evans hadn't noticed or didn't care--neither of which I would believe--WO Eaves' attention should have been 100% on making sure the craft was where it was supposed to be altitude-wise and including performing the controller's implicitly-instructed left turn toward the east bank.
Previous reports were that Capt. Lobach had 450 hours of experience, not 45. If that's accurate, someone's apparently been engaged in cover-up, which would suggest mens rea, perhaps where the Biden connection might indicate proper, high standards had already been subverted.
She was pilot in command. The warrant officer couldn’t take controls from her, even if he had more flight hours. She was a commissioned officer.
She screwed up, and he should have taken control and said, “I have the aircraft ”!