While out on a routene all out ticket the customer had pulled up beside my truck while on the phone to dispatch a small tree limb no bigger around then your thumb had come to rest across all 3 phases at some time in the previous days (we had a storm 2 days prior)......well it picked this time to start arching and proceeded to burn all three phases to the ground 2 fell dead with one laying hot on the ground. I did say I was on phone to dispatch I did tell him what was going on and held phone out the window so he could hear it roar . He said when you get your bearings straight tell me what you have and what we gotta do.