I can't believe this happened.
When the cartoon editor first received this strip, he emailed me to ask what it was all about. I checked my own rough sketch and the second speech balloon finished with the words "track down a dangerous outlaw". When Andrew draws and letters a strip, he is listening to the radio. We can only assume that, while he was lettering this particular strip, the word "curtain" came over the radio and he simply wrote it out. Bizarre, I know, but it HAS happened before!
What is really annoying is that I told the cartoon editor all this and, after sharing a laugh, he assured me he'd fix it before publication. Aaaaargh!