 As Mohinder injects Scott to test the formula, Arthur senses a disturbance and goes to his office to find Peter waiting for him.He tries to disarm him, but his powers are blocked by The Haitian who's also there, but Arthur's too powerful for The Haitian to block for long and he urges Peter to shoot Arthur.Arthur tries to entice Peter into changing sides by promising to use the formula to restore his powers, but Peter refuses and fires when Arthur insults him.