Cessna 206 and 207 aircraft (and 210's for that matter) have a right, left, or off fuel selector, no both position. That is a fine fuel system, and I actually like it better than the right/left/both systems in the 185's, for a lot of reasons.
But, when the motor pukes, your first response should be, switch tanks, fuel boost pump on High, while heading toward a safe landing zone. My guess is, he got totally focused on heading for a landing site. We train people that at low level, they should totally focus on flying the airplane, but that height should be like really close to the ground. At 600 feet, there's plenty of time to get a fuel starved airplane running again, and no excuse for endangering people on the ground, let alone wrecking a good airplane. That said, I'd never claim that I could never do this my own self. If I did, though, I'd feel pretty bad.
And sorry, folks, but even though SFAR 93 prescribes certain altitudes for crossing the inlet, there are also higher altitudes available for crossing, or you could do what seemingly everybody but these guys do, and ask for a deviation from 93. I can't tell you how many times I've heard pilots ask for a deviation for crossing to Merril and I've never heard one turned down. The regulation is no excuse for crossing at 600 feet in a wheel plane (and probably not in a float plane either, for that matter). It's a matter of convenience, and that is'nt always the best guide to safe flying.
Mike V