When anger becomes the main emotion there is no way for human beings to control the narrative as their whole mind is clouded.
"What do you want from me?" Isaiah said in a full rage. "Father, I know you want to kill my friend, Vivian and I don't want to let that happen at this moment as I will do my best to protect her until my last breath." Isaiah looked at Vivian directly but only he could see was the figure of his father who did nothing but to consciously force him to kill and be emotionless because that is the part of their path and blood line.
His pangs are being shown and ready to fight by any given time.
'So this is really what's making him stuck.' Vivian said.