Jack tilts his head and smiles as he looks at Genesis' eyes. "Those eyes could get more intriguing, then? Never seen anything quite like that in a human before." The comment is very flirtatious, but also earnest, he's not pandering to Genesis' ego. Well, maybe a little. "Where would the glow come from?"

"So, you'd need the mako, the connection to the Lifestream, but also, the materia," Jack gestures towards Genesis' sword, "Kind of as a physical focus? And that's where magic comes from on your world?"

It brings up another troubling thought. "Connecting yourself to the Lifestream, that's gotta be a two-way street. You're using the Lifestream as power, through mako, but anyone who's using it as a magical source? As the planet gets weaker, so do you?" And maybe he realizes he's just answered his previous question.