See associated trip report.
Note on route name: This route is actually on the SW-facing side of the South Buttress of Angel's Landing. The route is called "South East Butress" (sic) on MountainProject. The buttress is a bit SE-tending, I suppose, but on a
map it strikes me more as a South Buttress than a SE Buttress. The route is called the "South Face-Unknown" in the SuperTopo guide. I've called it the "South Buttress (SW Face)" in the topo. Sorry for all this confusion over route name!