Technically, if the fault has cleared and the fusing has operated, the wire should by rights be dead. I wouldn't recommend picking up any fallen power line, mainly because of the fact that the line may have an Auto-Recloser on it and the wire may become live without warning.
Ya it comes from the term hydro electric Here in ontario Canada we had Ontario Hydro I think hes talking about gradiant voltage where you get a potential from one foot to the other due to the length or you stride?I had an old Linesman tell me if a kv line drops near you standard practice is to not move but if you must walk heel to toe.
I think we have a "Canadian vs American" English situation here.
Furthermore, I believe the question is referring to a line that has fallen and is in contact with the ground--at that point, the line is "grounded", and would one receive a shock if touching it? Again, I think that's what the question is.