Which line in this excerpt from The Still Alarm by George S. Kaufman demonstrates the use of understatement?
ED (follows over to the window R.): How is the fire?

FIRST FIREMAN (feels the wall): It's pretty bad right now. This wall will go pretty soon now, but it'll fall out that way, so it's all right. (Peers out) That next room is the place to fight it from. (Crosses to door L. Bob shows ties as Ed crosses.)

ED (sees ties): Oh! Aren't those gorgeous!

FIRST FIREMAN (to Bob): Have you got the key for this room?

BOB: Why, no. I've got nothing to do with that room. I've just got this one. (Folding a shirt as he talks.)

ED: Oh, it's very comfortable.