Reverse Missiles / not an "attack"

[David Johnston2]

Originally Posted by Witchking

Critical Successes let you do the improbable, even the extremely improbable but not the impossible.

Each GM runs their own game of course but an 'archer's' skill does not negate a magical effect.
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Even so it doesn't seem right that the defender could benefit in any way from the attacker's lucky roll which is why I think the attacker certainly wouldn't get the benefits of a critical hit and I would go so far as to say the arrow would go astray thanks to a bit of wind, a chance obstacle, or just enough unplanned movement on the attacker's part. It's not changing how the spell works, just the chance permutations of the arrows course back to its origin point.