Avalanche on East Galena (Fire Plug) Peak Ridge

I was skinning up from Galena Creek to ski down through trees on NE face of East Galena Peak.  Heard voices above me.  I was skinning up and as I made my zigs and zags was crossing the most prominent chute on the NE face.  Thinking the skiers above me might try to ski the chute, I quickly skinned across the chute one last time into the open trees about 30 yds from the edge of the chute that was about 30-40 ft wide.  I was at about 8,800 ft.  Wanted to be clear of the skiers so stopped next to a tree when suddenly I heard a yell "Avalanche".  I looked up and saw the snow powder plume of the avalanche and then the snow sliding down the chute and it continued well below my elevation. The skier party above me and I each yelled out "are you ok?" They were ok. I stayed there for a few minutes and the first skier skied down on top of the slide in the chute and stopped near me to apologize.  I asked what the trigger was and he said he stomped on the snow to see if it would release before they skied the chute.  I said no problem.  I knew to not be in the chute with them above me and was glad no one was caught in it.  The party of 5 each skied down the chute separatedly.  I transitioned and skied down through the open glade to the east of the chute with solid snow.  Caught up with the group and we chatted about the slide and the lead skier again apologized for not yelling something before he stomped his ski to test the chute snow because he had seen me skinning up and knew I was below him and his party.  Never did get a photo of the slide.