[quote=@Beloss]
My core argument is that you are choosing to interpret a Phantasmal Beasts turning slower than Servants, as meaning that this Phantasmal beast could not be fast enough to turn to evade a projectile in this circumstance, which does not have to be the case.  

As an aside, one of the archers that was covering me was player by you? Was their a specific reason why the Matou Archer did not fire? 
[/quote]

The reasons the Matou Archer has for acting have not been explicitly stated, for a few reasons. It is possible to form some educated guesses by looking at his matrix. I most heavily recommend looking at his Skills. 

Either way, from where I'm standing, I don't eee sufficient reason to overturn my verdict, so it stands.