Scary business

Today, as we were about to play the music before the show, we saw a police van pull up at the other side of the Danube. Several men jumped out and ran towards the water. We could see something floating downriver, but didn't dare to think it was a person. As 'it' approached the police men and was pulled out, it was quite clear 'it' was a man.
How did he fall into the Danube? And how long had he been in?

He was standing up when they pulled him back onto land, so that was good at least. A few minutes after they'd pulled him out the ambulance arrived.

It was another very cold day in Linz today, and being in the Danube instead of on the Danube doesn't really bear thinking about...