"Greta looked at me, huh!?... I'm Mark. I'm your friend. Now, please let go of that gun... Will you?" Mark was asking her nicely.
Saving Bill wasn't only his intention but also saving his friend, Greta.
Though he felt very betrayed by her, Mark couldn't stay angry with her knowing that he took a big part of Greta's hell.
He could not just let himself escape from the responsibility.
He believed that he could still convince her as they had been together for a long time and they got good memories together way back in the slum and in the present time.
They were inseparable before.
Their friendship was proven with time.
Greta was his protector in the slum and through everything they had been through, they always had each other's back.
"No... I can't!" With a strong refusal in her expression, Greta refuted.
Her opposing expression was greatly shown on her face and one could easily say that they have gotten to opposite sides.