Spooky avalanche on Molar's ridge

The day before yesterday an avalanche size 3 was triggered remotely by skiers from Molar's ridge. We suspect the avalanche ran close to the ground on the crust buried in late October. We dug on a similar aspect and elevation on Rudi's ridge and got no results on snowpack tests. Digging is probably not an effective way to learn more about this layer. The best way to manage this problem is with conservative terrain choices. We had a good day skiing mellow trees.