When there is water in the middle of the floor during a fire?

This just happened:

@work in Vancouver

Man (a colourful character, let us state) wearing a reflector vest pops head through the door and basically yells.

Paraphrased:

Man: What do you do here?

Me: We are the 'name my employer'...

Man: What do you do here?

Me: We are the 'name of my employer', we provide bibles.

Man: What do you do when there is a fire?

I walk towards him because he is quite loud.

Me: We call the fire department.

Man: What do you do when there is water in the middle of the floor where there is a fire?

Me: (Ending this) I have no idea.

Man departs...