The Director of SHIELD got security alerts as a matter of course; even working late, eyes tired from the long day of nothing more disastrous than the paperwork of everything that needed her attention, Maria caught the quick flash of the security blip. It was either a false alarm, or someone very good at getting into secured locations.
In this business, it was always safest to assume the latter. Maria grabbed her gun even as she checked the various cams, narrowing down the breach. She caught a flash of the colors, and sighed. She still kept her gun free of the holster as she headed out to collect the intruder; just because he was friendly didn't mean someone less friendly wasn't in behind him.
Or that her own agents weren't on the ball. The sound of a scuffle, and the crack of a weapon being blocked, had her picking up the pace and going carefully around the corner; no point in charging into the middle of a fight. Particularly when she knew both participants.
"Nightwing," she called out, "what have I told you about using the goddamn front door? People will think you were raised in Gotham. You can stand down, agent," she told Morse. "He's a friendly." Exceptionally so, but he'd still damn well better explain himself; she cocked an eyebrow expectantly at Nightwing.