The "bloody finger" show was the Hammersmith Odeon, not Dallas.
It brings to mind a geographically-relevant anecdote in Dave Grohl's memoir. He/Foo Fighters were playing in Australia and had a one day gap between gigs. He was committed to taking his daughters to a father/daughter dance in L.A. between the shows. After the first gig, he immediately took a chartered jet from either Perth or Brisbane to Sydney to catch a Qantas flight to L.A. Flew back, had a handful of hours to spend with his family and get ready, went to the dance and left for the airport straightaway after. Flew back to Australia during which - plot twist! - he endured a case of food poisoning. Then straight to the second gig where the doctor gave him an IV bag of liquid and an anti-diarrheal and, lo and behold, hits the stage after crossing the International Dateline twice in less than 36 hours and plays another three hour show.
In comparison, there is absolutely no good excuse for not expanding on what the "unforeseen circumstances" were for a cancellation with hours to go. The staunchest segment of the fanbase is way too forgiving on this front after years of abusive, last-minute cancellation practices.