User blog comment:Zathronas/Analysis by an author: volume 2 trailer part 2/@comment-3257939-20140708035929

The scene with Ruby holding Weiss has been confirmed (kinda of) during RTX to be a funny scene for the shippers of White Rose. They said that there will be some scenes like that which look serious but are just comedy relief and teasing for the shippers. Remember the JNPR's fort scene where you can see that the cafeteria is destroyed. I'm 99% sure that after the scene we saw in the production diary, Ruby's first plan for the best day ever is: Food fight! And Weiss is playing death as part of the game because she was knocked out of the battle and Ruby's like: Nooo! JNPR... You'll pay for this!

About the Yang vs Weiss. The only thing that I can think of as a proof of why it is a thing is the scene where Yang smashes the ground next to Weiss. It's not, you can see that they are in the battlefield of the fight with the giant mech so I bet is some teamwork. During the final scene of the trailer, Team RWBY is using those clouds to hide from the mech, where do you think those clouds came in the first place? I think Weiss totally freezes the floor so that Yang can smash it and burn it to create those ice clouds to hide themselves from the mech.