Wolf keeps an eye on the crustaceous monstrosity as it slowly meanders towards the statue, then disappears between the legs. Confident that the program didn't detect her presence in the node, her avatar sniffs around the scurrying data imps until it picks up the scent of audiovisual data from a particularly scrawny clutch of imps forming trails to five other nodes, including the node whence she had come.
Outside, Arm nods to Logan and takes up a guard position near the vent, keeping an eye on the rooftop doorway and the ductwork. Logan enters the sheet-metal tube and works his way westwards towards the warehouse wall, where a bright light is clearly visible through a large exit fan, also roughly a meter and a half in diameter. Keeping his head down, he crawls close enough to the fan to see that it's an old, rickety unit mounted high up in a large, empty room, near where the roof adjoins the wall. No guards are immediately visible, but his position in the duct precludes him from seeing anything below the level of the exit, and the racket of the spinning blades prevents him from hearing anything quieter than a shout.
Mechanics
My interpretation of the rules is that any Demon or avatar only gets one opportunity for detection per invocation of Ghost, even if it re-encounters the ghosted avatar in a different node, so Wolf will be able to hang around or follow the Mastiff without worry. The camera packets appear to be unencrypted, but I think actually intercepting them and seeing the visuals will require a Sense Camera action, which would break Ghost.
I will need a Sneak/Dex check from Logan (+2 bonus for being in the duct) if he wants to pop up his head to see more of the warehouse, since there may be guards or cameras with LOS to the fan (so an opposed check). A failure doesn't necessarily mean he is detected, but that some disruption to the normal appearance of the fan is visible, which might prompt someone to check more closely. The fan looks like it could easily be detached from its mount with a swift kick or ballistic encouragement.