Board Thread:Speculation House/@comment-14138255-20140815002519/@comment-226878-20140825024558

MetallicArcher wrote: Ren killed the first head stabbing it with the axes of Storm Flower, the body shaking after that doesn't mean anything, snakes sometimes bite, even after the head has been cut off, it's a characteristic of the nervous system of reptilians.

Even assuming it was only one Black Head and that the stab of the axes (that should have destroyed the brain) wasn't fatal for that head, Ren still defeated almost bare handed a high-level Grimm, where team CDLR run at the mere sight of an Ursa. While it's true the black head is shown to be obliterated and then appears again later, that's just the sign of poor programming. The fact that Ren's first melee attack against the Taijitu didn't work went toward showing us two things: first that high-level Grimm are more or less immune to physical strikes that aren't driven by extreme Aura (a fact that is back up later as RWBY and JNPR find it extremely difficult to harm the Death Stalker and Nevermore and second... that Ren is really not much of a skilled fighter.