You know, it's entirely possible that he looped the strings around something off-panel, letting the plane take the weight, and then lowered them down on a sort of pulley setup. (Yeah, it's implausible, but, y'know, so's the other thing.) What struck ME was not that - what struck me was the casual mention of 'fishhook arrows - which I use for fishing when on vacation'. Say WHAT now, Green Arrow? You catch fish by firing arrows at them and then reeling them in? I suppose it's not the worst strategy in the world, but for something that's supposed to be a relaxing sport, it strikes me as kinda missing the point.