Board Thread:Speculation House/@comment-14138255-20140815002519/@comment-14909251-20140826042739

All we have to gauge Ren's abilities and stamina is the initation where he took on a massive Grimm on his own using his Aura, then was forced to chase down Nora, had to run away from the Grimm with all of the others, and then fought the Deathstalker. Him being tired is to be expected. I doubt his performance in the food fight is any real indication of his ability either. He clearly is not one for all the zany antics and just went along with what the others were doing, like Weiss in that respect. There is also fact that, as I suspected, the whole sequence was just a demonstration of all the fancy things the animators can do with their new toys.