Besides just the normal "rules of the road" that the powerboat operator broke, lets apply some common sense.
By attesting that the skipper/owner of the sail boat were drunk, they could have caused this? Essentially, they are saying that a leaner in light air could turn so fast as to get in the way of a boat going ~50mph. Not defending drinking and "driving", but... come on... Where is the sanity check?
It's akin to being drunk on a bicycle and being hit by a speeding four wheel drive in the middle of an open field and then being blamed for it...actually, it's probably worse than that.
