GILES: It's gas. She's snuffed out the pilot light! The gas is on full! I can't find the shutoff valve.

(Xander finds the valve handle on the floor.)

XANDER: Is this it?

WILLOW: Okay, that's bad. How 'bout the door?

GILES: NO! One spark and you'll take the whole building with us!

(...) (Giles tries to turn the gas valve off with his bare hands with some success.)

GILES: That should give us a few minutes, but we b... If we don't get out of this room soon...

WILLOW: Why is Marcie doing this?

GILES: The loneliness, the constant exile, she's... (coughs) she has gone mad!

XANDER: Ya think? (coughs)

(...)

(Xander & Willow are passed out, Giles is almost gone)

ANGEL: Come on!

XANDER: What happened?

ANGEL: You tell me.

WILLOW: (waking up) I'm up, mom.

XANDER: (notices Angel) Hi! What do you want?

ANGEL: I brought you the Codex. (hands the book to Giles) I came in through the basement. I smelled the gas.

GILES: Yes, w-w-well shut it off, otherwise, uh, the whole building will go up!

ANGEL: I'll get it. It's not like I need the oxygen.

written by: Ashley Gable & Thomas A. Swyden; Transcribed by: AleXander Thompson. Full transcript at:
http://www.buffyworld.com/buffy/season1/transcripts/11_tran.htm