The thing was that Arthur himself was sure his arrow would reach its target without knowing how, so when he saw the arrow moving following this suction force he was surprised and happy.
Either his master was helping him, or this pillar was really sick of all these tries to make it turn to the dark side, and it decided to make a stand.
Or perhaps it's a thing of the arrow he made following his master's instructions.
Once the arrow was launched, nothing stopped it; no arrays, no monsters, not even attacks of different kinds on the arrow.
Arthur was happy and wanted to stand and see what would this arrow end up with, but he wasn't protected from the wrath of the arrow; he was simply exposed to what was going to happen next just like anyone else here.
Or that was what he believed.
So, the next moment he didn't bother himself with anyone here, turned around and rapidly hit the ground towards the portal, taking less than one hour to do so.
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