One of the scariest things that ever happened to me when I was a firefighter (and in a rural company you're all of the engine, the truck, the technical rescue, the EMT, the fire police, the dishwasher, the engineer at once) and I was dragging an uncharged 2 1/2" line into an old paper mill that was having a fire in a sub-terranian vault that used to have paper pulp in it. I had to lay down to see into the vault. I radioed to charge the line - and as I saw the water coming, I realized that the hose was wrapped around my leg. Got out of that 5 seconds before the water hit. I dragged charged lines after that.