Harry would sigh as Gou walks out, damn guy stiffing him on the bill... Oh well, he's not exactly hurting for cash right now. Harry would find out how much the info dealers things cost, and quickly hand over the cash for them before turning back to Yu.
"I've barely done anything Yumina, I've just given out some advice and talked to you a bit that's hardly anything worth risking your life over. There's no need to try and pay me back for such small favors, so don't worry about it alright?"
He's always been a sucker when it comes to helping people... Besides, getting this girl into danger reminds him way too much of some other things that have happened.
"As for magic, yeah this stuff isn't like skills in a video game or something. My power is a hell of a lot more than just learning how to cast fireball then being done, it's like... Learn how to cast fireball, do it 100s of times, improve on it some, rinse repeat. I've been at this for decades and I'm still a novice compared to some people. And like Gou said, it really is best to train physically too. I did the magic at the same time, and till recently always leaned on said magic a lot more, but I can't say that's best."
With that, the man would get up and wave at Yu cheerfully. It's about time for him to head home, and the Nevernever is a pain in the ass to treck through. With that, he'd stand in the doorway of the cafe and hold his hands as if he's about to pull open a door on the threshold.
"Anyway, I'll be going for now but you know where to find me! Oh and like Gou, I could teach ya a thing or two about physical stuff myself... You would be amazed at how much a wizard detective has to run from things. Anyway, Aparturm."
The man pulls, and a glowing gateway to another world takes shape in the door to the cafe for a moment. He'd walk through it in a blur and snap the portal shut long before anyone can follow,
and with that Harry Dresden sets off for his home. Of course, knowing his luck he'll meet a pissed off Fae on the way or something.