There is no need to debunk every claim. I could say "the rods are held in an unstable way" and "your mind makes your body do things without you noticing" but that's just a guess at what happened. I wasn't there, and it's not necessary. Claims can be made vastly quicker than debunkings can.
It's the other way around: people who claim they can do water sensing should submit to controlled experiments. After that, we'd know what their performance was given the experimental circumstandes.
Beside, the burden lies with you to convince others, not the other way around.
Also, non ferrous.
Also, film it from above so you can see if several people, on several passes, get the same movement at the same location. Ley lines shouldn't move, right?
Sounds like you could solve this in an afternoon.
How could a ley line do nothing but make a metal bar wiggle arbitrarily and inconsistently?
Did you find any water?
And second, how about you go and read some things from skeptics about dowsing and then ask that question? One of the most tedious things on the internet is somebody who basically says, "Please argue me out of my own ignorance." Sorry, but your ignorance is your problem, and it's rude to inflict your problems on others.