User blog comment:Darkcloud1111/Good Idea, Bad Idea-Best Day Ever/@comment-2006510-20140725222552

They were hardly indestructible; they're only limited by their Aura, which CAN block damage when channeled

After Ren was slammed into the floor, he struggled to get up, and couldn't. Weiss was knocked unconscious by the hit against the pillar, but otherwise recovered likely due to Aura. There are numerous other background examples of Aura being the likely reasoning

If they had fought for real before the food fight, then it'd be excessive - but I see it as perfectly fine

Plus, we already knew they were bad guys, merely by having them show up with Cinder and Roman at the end of Vol. 1; that was established. That scene just established how they handle things - which works well enough imo