Propagation in low elevation bridgers

I was teaching a snow science program at crosscut today and our group got propagation (ECTP21) in our test pit on the facets at the ground, ~80cm down.  The snow was 85cm deep at that location.  We were on an eastern aspect around 6200' in a treed area.  The students (bozeman 6th graders) were very psyched about getting to try what they'd seen on the mtavalanche youtube and seeing unstable results!