Yeah, Swallows Return looks pretty cool, too bad it's not as good in actual use as it is cool. Firstly gets dodged, then looses to a normal strike of Excalibur, emphasis on the normal bit, Assassin never even saw what Excalibur is really capable of. Quite dissappointing that Assassin doesn't have a proper noble phantasm. From the fights, his skill seems to be superior that that of Sabers, but Excalibur raped him nonetheless, like it raped everything else.

And only if the animation team of Fate/Stay Night did their storyline properly, it could've become that much better than it is now. I found their adaption of the storyline quite disappointing, too many loose ends and WAY too much stuff that is not explained properly.