"Metabolism-based, then." Ghost sounds like he's pondering, "The Porter AI has an interesting array of ability samples."

"...don't be sorry." Ghost becomes visible again standing behind Houston, watching him intensely, then starts to float lazily off down the street away from the cameras and building both. "I thought it was interesting." Whether this concludes their conversation or not isn't exactly clear, but he doesn't seem like he'd object Houston following.