What did Grayson do to make maniac smile and say A-Men?

Grayson made Maniac smile and say "A-Men" by showing kindness and understanding, particularly in a moment of connection. He offered Maniac a warm meal and a safe place to stay, demonstrating compassion and acceptance. This simple act of generosity resonated with Maniac, evoking a heartfelt response of gratitude and affirmation.