Zayn was pretty sure that Merlin had a dual personality. If not for that, it would make literally no sense how Merlin's attitude could change so quickly.
At first, Merlin had been overly vigilant and wary of every single move Zayn made. It was almost as if he was obsessed with finding Assassins that didn't exist, in the first place. He seemed to relax quite a bit when Merlin found out that Silas sent the letter of recommendation from the Adventurer Hall and that Zayn was acquainted with Silas.
After they figured that Zayn was not even in possession of a proper weapon, they made their way to a renowned weaponsmith. Merlin Kivan decided to accompany Zayn because he was the only one who actually knew what kind of weapon Zayn required to extract the highest potency out of the One-Armed Saber technique.
He had yet to reach maturity, which was another factor Merlin had to take into consideration when it came to finding out the best properties of a suitable weapon.
