^^ You calculate your altitude, glide path, and really REALLY quickly you draw an imaginary circle around your position, with that circle representing the furthest you can go, trading altitude for distance.
You gotta land somewhere within that circle, and you have to make your first final approach your best, because you've got only that one chance. Me, I like golf courses for this sorta work, but the damn sand traps...
I was working in the area last night and drove by on the southbound side about 20 minutes after he landed. The ultimate case of "well there's something you don't see everyday." Really excellent bit of flying by that guy to put her down and not hit anything..