User blog comment:TheNewProtagonist/GRIM SCORPION!/@comment-4834824-20130830005747/@comment-6906412-20130830030259

Just speculation coming from me here but maybe the chess pieces are each linked to different students somehow? Just because Ozpin doesn't say anything about the "relics" and Yang kinda jerked the knight into the air when she picked it up. I think maybe the test is to find which chess piece corresponds to which person to launch back up the starting cliff. Or maybe I'm totally wrong and it was just Weiss getting pissed at Ruby. Or another large Grim or something of the sort.

Anyway I like your ideas about the flying people leading to the formation of the 4-man teams, though. Very plausible, but only time will tell.