If his equipment is grounded and the firefighter is wearing properly insulated fire fighting gear he likely won't be electrocuted (I never needed to test this theory while on a Navy fire detail) if the water spayed is clean water, at high velocity (from a fog nozzle) from the hose AND you are NOT standing too close. Clean, pure water is an insulator. It's not a perfect insulator but most of the electrical power and current will be on the low resistance path up around on the burning pole and wiring, not down the water stream to the hose operator.
Looks like a normal thing firefighters are taught to handle with the proper equipment. Was that electrical arcing or just hot embers being exposed and dropping because of the water blast? I would suspect the power has been cut to that location due to the number of ladders operating near the lines. If you look at about 20:00 in the video they are spraying the pole with wire with no arcing from the sidewalk but when they move to hit the pole fire from the street angle is when we see that looks like only burning embers being exposed and falling to me.
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