Crusts are really only nasty when they are buried. In this case you can get a temperature gradient across the crust - this is point where the temperature in the snow changes rapidly over a short distance. This can lead to the formation of faceted and then depth hoar crystals which will present a weak layer. These can form either below or on top of the crust so that when the snow above is overloaded, say by the passage of a skier, the whole slope down to the crust breaks away.
Just as nasty the crust, or simply a layer of icy snow, can itself can form a sliding surface when it has fresh snow sitting above.
What would worry me is what is below the crust. The crust itself may actually bridge over a weak layer. Of course a thick wind crust is effectively a large slab of snow (windslab) which is sufficiently loaded, normally by a group, can break and slide on the surface below. But I assume what you saw was a thinnish crust formed overnight by the freeze/thaw cycle.
Given the length of time since the last snowfall at the weekend the powder may have been facetted snow - basically snow crystals that have turned into powder by the action of the cold. Nice to ski when the crust melts.