Interesting video. I'm amazed that a passenger would pull out a camera, or phone in that situation.... but interesting to see.
At around 14 secs in, is that a crew member saying "I just couldn't stop it going down."?
If it is, we all know there could be all sorts of reasons for such a statement - weather, engine failure. I guess we'll find out in due course.
Great job, for 'stopping it going down' enough for a safe water landing and text book evacuation.