A shame.
It can happen so fast.
A few months ago a man sat next to me at a train
station, literally 35 seconds after he sat down I was giving him
CPR.
I just about kept him alive till the paramedics arrived
15 minutes later. No idea if he made it, and I guess I never will.
He also cracked his head on the concrete when he fell so I had
to deal with the sight of his head bleeding while I did it.
It's up there with one of the worst experiences of my life.