Pulsing a firefighter hose to prevent electrocution - GIF

Pulsing a firefighter hose to prevent electrocution.

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Previously:

Ambulance explodes in front of firefighters - GIF
Firefighters driving through wildfire - GIF
Firefighter bravely puts out fire to save trapped couple - GIF
Firefighter elevator tools - GIF
Firefighter putting out car fire in under a minute - GIF
Firefighter training stairs - photo

They're probably fine. This isn't high voltage. It's standard practice to wash energized high voltage insulators by spraying water on them. And power lines don't kill everyone when it rains. But I guess you can never be too careful.

https://www.youtube.com/watch?v=oqJbq1rRTms
https://www.youtube.com/watch?v=gryu5TExg4A
https://www.youtube.com/watch?v=iaMSlF7goO4

It's my understanding that the water used is deionized, reducing it conductivity.