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The first part is correct.

Let me see what we already have:
We know that there is a sunshade fill with water. The water is probably rain. They had to close it because of the weigth if the water, if not the sunshade could tear apart?
So that’s what they did!
Probably you were standing at the door and the water is push of because the sunshade went back into his casting?

One important detail is not correct. You are in a tie for the bounty :)

This detail can't be deducted from the images...

Okay, lets see if we can improve the answers a little bit more.
You asked to owners to do this so that we kept on guessing?
😂

No :)

I didn't ask the owners anything. In fact, they warned us that this will happen?

So ... what is this?

@ervin-lemark my wife thinks that she knows it
Is it an automatic sunshade that slides in as soon as the sun dissapears or at a certain time at evening fall?

I will go back to the drawing board and see if something pops up!

This keeps intriguing me.
I guess that you were sitting on the terrace of the hotel. It appears that it did stop raining!
When water was off the shading it went wet and somebody slipped?

Your wife has got it almost exactly right.

Yes, it is an automatic sunshade.

One tiny detail is still not right. I will not prolong this bounty. It was enough so I declare that ...

@fullcoverbetting's wife is a winner :)


And the answer is ...

The shade automatically rolls in when it detects that the rain is falling.

Since it was quite a storm a pool of water already accumulated on the shade. When the canopy rolled all the way in this water obviously had someplace to go. So it dropped down like a waterfall :)

The owner warned us that this will happen so we were able to escape the watefall :)

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