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Did one brother gain notoriety, and therefore another rejoiced for him? Well, well!
New here? I'm Roha — want a quick tour?
Someone wrote this brother's name in a death note, stating that he would commit suicide.
Did the brother become infamous? i.e., for doing something bad?
Could someone who got on the train be mistaken for the brother?
More likely, they were both potential suicide bombers, but one had already carried out the attack, while the one on the train was just planning to.