Pit at Prayer flags

Did an ECT on west aspect at Prayer Flags. 1200 m elevation at tree line. 30-33 deg slope. Sudden crack and full propagation on 8th hit from elbow at 65 cm depth. Failure was just underneath crust. Failure maybe on facets? Did another ECT on southern slope at 1200 on 25-27 deg slope without results. Skied Burnt Trees onto Terminator. Very heavy snow and sluff ran. Still fun though.