Triggered a big sluff/mini avalanche by the Gazex above the ski patrol shack on Milly. Crown varied from 1-2 feet. Slide went down to the new snow/old snow interface. Given the steepness of that zone and the nearly 2 feet of pow up there, the slide picked up momentum and entrained enough snow to take people for a ride and perhaps cause a burial in a terrain trap. I made sure the slope below was clear of people before dropping in, there was no terrain trap below, and I expected the new snow might go, so everything worked out fine. [Forecaster comment: Good to notice rider made sure no one was below.]