To seek help

Aiden did it. He without doubt had killed the mad Black Hunter, a person. 

The Black Hunter is still standing, but with a sword that pierced his body. 

"Did he kill him?" asked William.

They don't know, because of the previous incident, they didn't want to immediately celebrate victory.

"Don't let your guard down, stay behind me. Alden, step back!"

Dustin didn't know why, but he had a feeling that Aiden's attack didn't kill the madman. It's not Dustin doesn't trust Aiden, it's just their enemy is a Black Hunter, a mad one.

And from what he heard; Black Hunter with a strong devil seed has the ability to regenerate. Without doubt, the madman right there is so strong. 

Dustin wants to send the apprentices tot he way out. But looking back to the time, the madman's AOE attack is so dangerous. If he not walking with the youngster, he would likely lose all of them.

"Aiden!"

"Hey, why are you just standing there?!"