If the attack coming strait at you is sent to the right, then it wasn't REFLECTED, it was DEFLECTED.
Yaata was stated to reflect or
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The snake heads were not turned back or reflected, they were sent straight up and under the shield.
re·flect
[ri-flekt] Show IPA
verb (used with object)
1.
to cast back (light, heat, sound, etc.) from a surface: The mirror reflected the light onto the wall.
2.
to give back or show an image of; mirror.
3.
(of an act or its result) to serve to cast or bring (credit, discredit, etc.) on its performer.
4.
to reproduce; show: followers reflecting the views of the leader.
5.
to throw or cast back; cause to return or rebound: Her bitterness reflects gloom on all her family.
de·flect
[dih-flekt] Show IPA
verb (used with object), verb (used without object)
to bend or turn aside; turn from a true course or straight line; swerve.
That doesn't matter, the same thing would happen if Sasuke's sword hit something very durable. The fact that yaata didn't reflect an attack shows that the literal statement that it can reflect any attack is false.