Seekers don't conduct electricity super well, so it would be similar to a bird on a wire. I'm sure it could work with some wrangling but I don't know the physics enough to comment right now.
Neither is a human body. The fun begins when the electric current has nowhere else to go. If a body severs a cable when it falls, it is in for a shock.
That said, I think the gravity already provides a good enough boost for the encounter.
[ ] Plan: Master pitcher
-[ ] Grab the ball, run out of a warehouse, and throw it as high up as you can muster. Time it so that the sorcerers appears close to the apex so that it feels the fall.
-[ ] Estimate where it'll land, gather the mortals and tell them to prepare everything they've got to fry it when it falls down.
--[ ] Run it down with the truck?
-[ ] Hope you've softened it up enough and go for the kill.
The kids can't be completely useless if they think they can take on most threats, but we probably should appeal to Bone. We've got about a minute or two at most to explain anything, so we must be quick. Bone is the authority here, and it's his granddaughter's life that's on the line. He is more likely to cooperate, and the rest should follow.
If we can get an alpha strike in, we stand a better chance of dealing with it permanently.
Is there something we can use as an impromptu weapon that would be somewhat effective? What if we run a truck into it?