Toured behind the Knob (out of Mint Valley TH) and into the Two Lakes Valley. Approached the cirque in the back of the valley and climbed the W/NW shoot on the eastern ridge of the valley. Snow was refrozen avy debris at the middle/bottom and the top was soft settled snow. 20 feet from the top we discovered an obvious wind slab roughly 40 feet across the topout of the shoot which produced a shooting cracking when stepped on. We back down and descended the shoot with no incident.