[He's tearing out a piece of paper from the textbook (which is blank, because this IS a paper airplane-making class, and presumably has paper available in it for said plane-making) and working on folding one on one of the desks.]

So it's like...this. Fold it in half...then diagonally...same with the other side...

[And bam, a regular paper airplane. He holds it up.]

Then, you, uh...toss it like this.

[And it glides! And hits the whiteboard in the classroom and falls. But it did glide!]