In addition to knowing what you're doing in the BC and having respect for the snowpack, this video is very instructive about two other things:
1) After you ride a pitch, get to someplace safe while your buddies comes down behind you and,
2) just because someone's already been on the slope doesn't mean its safe - notice there were about a half dozen tracks in the general area where the boarder landed his jump and started the slide.
These guys were lucky to just get dusted by the cloud - I can't help but wonder if someone's beacon was inside the daypack on the snow...
Be safe out there, and remember: "In case of an avalanche, the best place to be is somewhere else."