Never say never - it's not uncommon for eels to bite things for territorial reasons and it's likely a bite for territory on a lure will result in a hookup.
I saw a trolled fly get absolutely monstered on Lake Rerewhakaaitu - only time in my life I've seen a trolling fly reel literally smoking. It near spooled this thing in about 8 seconds, longest 8 seconds of the guy hanging on to it's fishing life I think. Hook came back straight, literally straight. I'm fairly sure it was a fly being trolled, rather large one if I recall. The guy on the helm stopped the engine out of gear on the hookup and the little boat started going backwards no joke. There is nothing else in that lake that can do that but an eel.
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