Start on the low holds under Pratt's Mantel (farthest left side of the wall). Double dyno up to the sloping lip, get your feet up and mantle over.
Lots of fun. The easiest way to do this is to hit it right the first time. Otherwise, I think you'll scrape your tips a bit when you swing out. The mantle (if you do it pure - no edge to the right) seems a hell of a lot harder than the dyno, but I guess those old school dudes (Pratt, etc.) were pretty burly.