"...what is the Weave?"

"It's the underlying fabric of reality itself. It's the way mortals can touch and shape magic. It's Mystra herself."

"...I'm pretty sure we had the underlying fabric of reality?"

"... you probably weren't in a formless void. Right. Mystra may make it easier to tap into locally."

"I'll try but just be warned."

He smiles. "I will swear I will not judge you if you can't. Now, follow me."

He makes a sweeping motion with his hands, and there's a brief burst of purple light. 

He... copies the sweeping motion with his hands?

(Last time involved more Detect Magic.)

There's a burst of purple light!

There's a feeling too, something warm and comfortable, like sitting next to a friend in front of a fire. 

"Excellent! Repeat after me: Ah-thran Mystra-ryl Kantrach-Ao." Instead of a burst of light, there's a glow.

"What the fuck?!"

He drops the light, or at least attempts to.

It fizzles out.

"You were doing rather well."

"I cast a spell?!"

"You did!" Technically it was with his help, but the fact he casted it was what mattered.

"Back home it takes years to be able to hold a scaffold! I wasn't even doing any topology! I just waved my hands!"

"I was helping,  but even so it was-- holding your hand while you took the first step. You were the one who did it."

"Mystea made some good shit."

He smiles. "She really did."

"Let me try that again."

He demonstrates the motion again.

This time he's not startled by the light.

"Is that warm feeling you?"

"That's the Weave."

"I'm gaining a new understanding of how you have sex with it. --What do I do now?"

That's not where he expected him to go. "Relax, and try and picture perfect harmony." That is the standard next step in these sorts of demonstrations, but also. Hmm. It doesn't sound like that in this context.

"Like, musical harmony, or drinking with friends, or...?"