Responses
It might be that the teacher's aura is as toxic as the duke's. In addition, it looks like he is either a hunter or at least a helper because he found the horseshoe that Aika saw in her vision.
They need to be careful in recruiting people for aika, who knows what are their backgrounds was, Duke deslyn must be one of the master of the hunter that collects relics.
Migth be the hunter that she feel and the teacher he seems suspicious I wonder why is it she never feel any threat to him yet? And hahahaha, getting jealous over a young boys. Uncle