Big weak layer facet, most of them were 2-2.5mm (13-20cm). Possibly one from the top of the weak layer interfacing with the next crust upwards (20-22cm)
Although I was unable to produce propagation on the standard ECT; I went for extra credit and got ECTP40, with ten extra taps from the shoulder, from the weak layer at 13-20cm from ground. This was a Q1 SP that popped out into the pit. When the slab popped out, it also broke an upper section at 75cm from ground, likely previous storm interface.