He's not a murderer. In fact, the people who contact the Dark Brotherhood are almost never murderers, because why else would they contact them? Even if he was, why the hell would your reaction to a murderer be to murder him?
he IS a murderer, he has intient and motive.
He has no guts to do the deed himself.
I'l kill his mark, and send her to sithis. I want to send him to sithis too.
and just becuase he did not bring the axe down, does not mean he is innocent of the crime.
I still want to know who put the hit out on me.
I've wiped the floor with two asssassins so far