I gather it's a complex process.

[He nods contemplatively, taking a moment to replay Gamzee's demonstration in his mind before placing his thumb over the hole at the side of the pipe as instructed. That was simple enough. He's about to progress to the next step when it occurs to him that he's definitely missing something important. He then turns slightly, apologetically smiling at Gamzee. ]

Would I be able to borrow your lighter?