1 Kyros: Let's settle this with a vote. Those in favour of going back into the Secret Dwarven Passage to find Alvissa?
1 Draak: Draak.
1 Lambert: Aye.
2 Kyros: In favour of pushing ahead with the quest?
2 Dwalin: Aye! {translation: Aye!}
2 Mordekai: Aye.
3 Kyros: That leaves me with the deciding vote. Hmmm.
4 Kyros: This Swamp of Terror is probably full of pockets of highly volatile marsh gas, right?
4 Lambert: Errr...

Interestingly, as of writing this annotation, the Wikipedia page on marsh gas redirects to methane, but the page on methane doesn't make any reference at all to marsh gas except as an alternative name. So there's no explanation of why it's called marsh gas, how it's generated in marshes, or its properties and behaviour in marshes. Which is a shame because it skips over the whole connection to Will-o'-the-wisps and all the strangeness that flows on from that, which is much cooler to think about for a fantasy setting than carbon tetrahydride.

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2018-01-10 Rerun commentary: Marsh gas now has a separate Wikipedia page all to itself, albeit fairly short. Checking the page history, it seems the page was created in 2002, five years before this comic was originally published, but in 2004 the content was merged into natural gas and the link to "marsh gas" redirected there, followed by the redirect being changed to biogas in 2006, and then finally to methane in 2007, just a month before this comic's original publication and the writing of the above annotation.

Since then, the page was revived as its own topic, removing the redirect, in 2012. Far be it from me to understand the whys and wherefores of Wikipedia editing. It's probably much like voting in a group of fantasy adventurers.