"Can't it?" you ask. "This is a Jounin we're talking about, here."
"It doesn't matter if we were talking about the Hokage." Saki insists. "It doesn't matter what your rank is, chakra works the way it works. It's a fundamental force, like gravity. That's like saying that fire can be wet if you're a Jounin."
You cross your arms.
"No. Do not. Try to make wet fire." Saki says, sternly. "You'll kill yourself and maybe make steam."
"Mhm?" you say, obstinately. "Then you're saying that just because we know how to do a lot of things, we shouldn't try to work out ways to learn how to do more? Besides, what about elemental techniques..."
"You don't throw chakra out and then try to make it into a technique afterward." Saki stresses, then leans back and sighs. "You make the Jutsu first, and then you let the chakra go. That's how it works, it's even usually in the names... like your clan's favorite coming of age jutsu. You release fire-natured chakra that is shaped into a great fireball."
... You scowl, not really wanting to discuss the traditions of the Uchiha clan.
Still, what you've learned...
"He's definitely venting chakra for something, though." you point out.
"I said it looked like he might be doing it deliberately, but I wasn't sure." Saki objects. "That sort of thing is what some debilitating poisons do, limiting the ability of enemy ninja! Doing it to yourself would be counterproductive..."
Yeah, yeah, you've stopped listening.
---
[ ] If he's doing it, it's possible. To vent a lot of your chakra out and then do stuff with it afterward, you mean. And you're going to try.
[ ] If you have to do stuff first, but Gai isn't doing anything that can be called a jutsu... maybe he does most of the genjutsu in advance, and then lets it seep out a bit at a time?
[ ] ??