User blog comment:B214/Light Novel Volume 16 spoilers/@comment-95.234.163.134-20131213181740/@comment-9339850-20131213210217

ascalon isnt nearly strong enough to do much damage to Rizevim, thats basically the short of it. And even then, He isnt dumb or slow enough to actually get hit by such a simple attack (even if the sword was powered up to redicuous levels)