The problem with the arrow-breaking stance isn't in the space-bending properties that DG9J sometimes has - it is the sheer speed and reflexes that is needed to pull it off. Knocking one projectile back to its sender isn't particularly surprising (pitchers sometimes get their ball hit back into their face, after all), but to individually target each incoming projectile (out of potentially hundreds) and poking each one separately back to the sender before they hit you, is insane. You would need to be as fast as the Flash, such that the world around you appears to be practically standing still, to pull it off.
If FQY could really pull this off, then he must be orders of magnitude faster than DFBB, and would have no problems killing him in one hit!