Title text:
That was quicker than usual! The cabin's sprinkler system often makes it really hard to keep anything lit.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3114/
It’s a typical instruction delivery speech structure:
- Okay, let me tell you how to ____
2-n.
n. And that’s how you ____
(Optional) n+1. Any questions?
Hence the text in panel 4 completes the pattern.