[Steve in Pudsey]

Thing is that it's sometimes not possible to instantly put up a breakdown caption. Sometimes when things go wrong it doesn't matter how many people are present if the technology's against you. 

Also in events like this there's a certain amount of reaction time and even longer time to assess what is going on

As for a lack of announcer, the audio during  breakdown slide was totally corrupt so I think even if there was one he/she would have had trouble talking on air

I get that sometimes there will be a catastrophic failure, but isn't there usually an emergency cut or router cut to get a dedicated source with the apology caption on air quickly even if the rest of the suite has died?