It was the terror attacked in Nice France
I hope that its the Nice attack, because it means that it's not a health issue. But I doubt it a bit. Why would the others say that they don't go into detail and won't talk about it when Bono already talked about it last year? So it's nothing that isn't know yet.
And would it really cause such a feeling of a "brush with mortality" when you're caught in a restaurant nearby? Is this worse than the bike accident where he almost killed himself? ("those setbacks didn't compare to another crisis Bono faced last year")
We had a guy here in Munich in July 2016 who run amok at a shopping mall. He shot several people in the shopping mall and then outside the shopping mall in front of a McDonalds. Everyone thought its a terroristic attack first. I remember that the hubby of a friend was in the shopping mall at that time, and all the people in the shopping mall were caught in the shopping mall for security reasons until late in the evening. The people couldn't leave before the police found out that it's not a terroristic attack but an amok run by a single young guy, and after the police found the guy dead, as he shot himself.
So the situation is quite similar. I can't remember that my friends' husband told something that he felt agony.
Hmm maybe Bono will talk about it once.