The 15% reduction in accuracy is enough, in situations were it matters. This really implies that Maul will last exactly 6 turns at most (7 if you count the miss) in any situation (beyond prone). The title shouldn't say miss when the maul finishes at 6 when they are prone, it should say exhausted.
In fact, after 6 consecutive attacks exhausted would be the appropriate term, because if it hasn't died after 6 attacks, I think it would be exhausted.
Although, I've been having fun recently just pulling earth and watching the jugs kill anything they attacked.
I don't know how large of a problem this is at the moment, nor do I think this situation will occur too often, but now that we pointed it out, maybe a certain AI programmer, might put it in as a special battle tactic for Yithril. Providing a very dangerous situation for mauling juggernauts.