Ghost had been mapping the radar coverage in and around Millenium City and Lake Erie, flying nape of the Earth to stay under radar cover while working her ability to absorb radiation.
Visible spectrum light doesn't so much pass through her, which would make her invisible to normal sight, rather it passes to somewhere else very far away in deep space which makes her look like a two-dimensional hole in space. In theory, this should work for other parts of the electromagnetic spectrum, including radar. That would be extremely useful, basically rendering her functionally invisible to radar given that radar works by reflection. She's been trying to make that work.
With enough practical work done, she decided to come back to base to discuss some details with Socrates. Socrates has been an enormous help not just with her understanding the world, but with her understanding herself. She headed to the portal Socrates had provided for her under Lake Erie, there to discover two Destroids guarding it!
Ghost's mind was instantly as awhirl as confused. How in the heavens had it been found? Why were they guarding it? Why did they think only two would be enough?
She can't risk entering the portal with them there to see her use it. It is possible they are only investigating the area and do not know for a fact that this point is the portal, just that it might be. Best to not give them confirmation. Best that we move the portal to somewhere else very soon.
She elects to get their attention and lead them elsewhere, and what better way to get their attention than to start their disassembly? She circles around them to strike one with a charge to the rear. They are likely to detect her incoming, as she is hardly silent when flying underwater creating massive turbulence, but if nothing else it's good form to practice.
She strikes one and pieces fly. She heads off leading them, hoping they take the bait. They do, pursuing but oddly not firing. Perhaps their weapons do not work underwater? Perhaps they are range limited underwater? They are also moving much more slowly than Ghost would have thought. It is odd that Destroids should be sent on an underwater mission so ill-equipped for functioning underwater.
Ghost continues to lead them away, circling back frequently to strike them, again and again, to keep them interested. In the end, they meet their demise, well away from the portal actual.
It would perhaps be useful to analyse these Destroids, as this encounter may have revealed a weakness in them that could be exploited. She elects to take a head and arm weapon section back to base.
She enters and is immediately greeted by an alarmed Socrates, "Please go to the interdimensional prison with these pieces! They could contain trackers!" Ghost almost panics in her haste, racing to and through the portal with reckless speed.
"What have I done!?" Thinks Ghost. She drops the parts to the floor of the Demon base upon entry and does an about-face to return almost instantly. "If they did transmit location data, if it got through, the Homestead base could be attacked at any instant!"
This is beyond embarrassment. Ghost is utterly horrified at her stupidity.