User blog comment:BenRG/Volume 2 Trailer/@comment-11188061-20140705061507/@comment-10390252-20140705134344

FWIW, one possible explanation for the scene with Ruby carrying an evidently-unconscious Weiss is that this is some part of the prank that involves JNPR creating a Tower of Tables (and vending machine) and ends with RWBY laughing and Glynda about to burst a blood vessel.