monkey...think....commence descent inVS mode to attempt to capture the glideslope.they were..set GA altitude at some point.they did..continuing the descent in VS as they did....realize you are not descending fast enough and "pull open descent.the Boeing version a level change button which they did....surprise!!! the airplane climbs to the altitude set in the MCP!!....seen it done by SO many times....the Alpha floor...yes you are right...but i wasn't talking about that...