Responses
It's not his eyes, it's the fact that he says things without looking away. The perfect liar.
They think of him as a psychopath..they already assume he is extremely dangerous and is willing to do anything to kill them. They are scared and easy to persuade, so when he looks at them straight in the eye, without his voice changing even a little bit they will automatically believe whatever he told them and their brain will change things according to their beliefs.
So his eyes are extremely powerful? Tbh, belief is one of the strongest emotions in this world alongside desperation but how is he able to get people to BELIEVE with just his crazy eyes and words? Is it because the people were already assuming things and he basically just amplified them?