Hard to say Shred. In that situation, I know sure as shit I wouldn't expose the whole party to the hangfire threat. One person, quick search to see if you can get a hit, probably. You would want minimal people out there.
This scenario is most definitely the most nightmarish I can think of. You have a group that (hopefully) is equipped for a rescue, but it may not be safe to do so. Getting more people buried does not help.
All accounts were that this one was a fairly large slide. The official report is going to be an interesting read.