i dont think he was specifically targetting muskie - a 1/2 oz spinnerbait is a great multi species bait for the lake & anything will hit it - I dont fault him for being under-equipped, unless muskie was the desired target.
The one muskie that expired onme, came while walleye trolling with light gear, nothing i could do to help it - every year up that way i get muskie while walleye fishing, I am now experimenting with stronger floro leaders while eye fishing now, so that accidental 'skies wont wont bite me off with 3 trebles in there yap - working so far....