Her personality is definitely in Shadowslash's liking and this was exactly the reason why he put so much attention to her.
He wanted to make her into his disciple in the way of the sword, he wanted to see what would happen if she and his other disciple fought.
Phina has a powerful constitution that increase her dexterity and speed, not to mention she has a natural compatibility with the way of the sword.
On his other hand his other disciple Feifei has a unique constitution that grants her extreme speed, even though she had no natural compatibility with the way of the sword she is experienced in using the sword and have greater knowledge than Phina towards sword arts.
The training camp continue to grind the villagers into experienced fighters or assassins, there were some that shows promises first but wane after some time and there are some that are opposite to them.