[Rein's POV: ]
His first unique enchanted arrow was destructive, while the second one was a trap that didn't work so he used that arrow and shot it in some other direction.
'The arrow vanished, and then didn't appear for a long time.'
I don't know why he had done that since the arrow had not appeared even until now… but there was definitely some kind of secret motive behind doing that.
He must have done that to create some kind of distraction, or to trick Zoe into thinking that it was some unique kind of attack which he had used with either his 'card' skill that he most definitely activated when shooting the arrow, or to actually make some kind of unique attack.
'I don't really know what he did with that second arrow, but he had been making those strange techniques with his mentor, sir divine archer, so this might also be related to that.'