As said before, while Sev isn't the easiest person to get along with at times, Assassin was the one obviously being immature in this matter. From what I see in the OP, Sev really didn't do anything in the first place, Assasin was provoking him.
And Sev, your little trick (Becoming a police officer, trickin g him into the meeting) made me laugh.

Plus, he really did deserve it for killing you.
The boy probably just wants attention, and the corruptness of revenge has entered him, leading to an infection of Senior. Nothing a little Love couldn't fix, however. :3
Just as a final thought of the day: When life hands you negatives, don't despair! For one day they may
develop into a pretty picture. C:
/reference