Reaper stays in range of Widowmaker, able to place his trust in her sight without thinking too much about it. If he needs her input, he can just communicate with her over the comms. Just another day infiltrating a secret base in broad daylight (baselight?) without being seen.

He quietly seeps into the ventilation system, unrestricted by the size of the shaft or its entrance, and takes his time scoping out a good place to watch the rendezvous go down. Even sensors have a hard time picking up on his gaseous form, though the density of it discourages him from simply passing through any laser sensors. He just goes around them, or through the spaces. There's a lot of moving parts in this mission, and as usual, messing up on any part will prove disastrous.

Not impossible to salvage, but disastrous nonetheless.

He pours out of the vent, weighing himself close to the ground. Even if he's not exactly hidden, the sight would mostly confuse someone rather than alarm them straight away. Any Nysheef ninjas unfortunate enough to cross his path are quickly taken down, however. Just step on him, he dares them. Whoever is shadowing him to find unobstructed routes has a clear hallway to run through.