Finally the guy would throw out the line in just the right spot and my dad would shoot the bobber.
That is a great idea. From my garden potting bench at our ground-level basement door, I can easily see both ponds, but it is extremely difficult to see the bench from the ponds. The scopes on my .22 and my 1100 fps .177 air rifle are both sighted in almost perfectly for the middle of both ponds.
The .177 would be ideal, as you can barely hear it shoot -- and probably can't hear it from the pond.
Be careful, but get law enforcement involved -- local and state game people.
