Did this day 3 on my trip. Day 1 - Shepards Pass. Day 2 - Mt. Williamson. Day 3 - Mt. Tyndall and out. Much easier than I anticipated on the North Rib. Made it up in 1hr 50 and down in 1 hr 45. I stayed "right" until about half way up and then went onto the slabs. I really feel that if you are comfortable on friction slabs this peak is cake. There are even handholds to use quite often! If you shoot too far right like two of our compatriots it becomes quite challenging and intense. My partner and I swung left at the "bump". The bump is a large peaklet at the top of the rib. If you swing left here the climb becomes quite trivial.