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"Expert... is this why you became a surgeon?"
"As a surgeon, I have free food," Edward spread his hands, "What surgery doesn't involve blood? In case of a heavy bleed, I can stop it immediately. Dr. Watson appreciates my ability."
As a surgeon, Edward could not only satisfy his hunger but also find a sense of self-worth... Marvin was lost in thought and also felt a bit disillusioned about Edward's choice to be a doctor.
Saving lives and healing the injured seemed out of character for Edward.
At least when Marvin first met Edward, he never thought of him as a 'philanthropist' with a compassionate heart for mankind.
"Do you still have time to mind the store while helping out at Watson's clinic?"
"I can summon a doppelganger. When there's nothing much going on, I'll go over with my body," Edward said nonchalantly.