Raven tries to shove Hiro back. It would work in Reality because Raven has such overpowering strength. But avatars are equally strong, unless you hack them up in just the right way. So Raven gives a mighty push and then pulls his knife back so that he can take a cut at Hiro's neck when Hiro flies away from him; but Hiro doesn't fly away. He waits for the opening and then takes Raven's sword hand off. Then, just in case, he takes Raven's other hand off. The crowd screams in delight.