An interesting excerpt from an interview with TUF EDGE from the August 1985 issue of "Rock Hits!":
How did the band feel when tuf bono left the stage during "Bad Song About Herawin" (sic) at Live Aid? Was there much disagreement afterward?
Edge: Actually, we all assumed that he had gone to a secluded area for a bagel, which is a frequent practice of his during rehearsals. Heh, in fact he says "Bad" is a pretty good song to listen to while eating a bagel, I haven't actually tried it. But that is truly what we thought he was doing at Live Aid. And I personally had no problem with that. When we found out it wasn't the case, we were absolutely devastated. You really think you know a guy, but tuf bono defied all expectations with that.