Rumun goes to Haydriss' room. Haydriss was the only representative and apprentice of Darth Malgus here at Nar Shaddaa and his master, Darth Hoshi, was interested in extending an alliance with Malgus' forces. There is much to gain between both Dark Lords. Hoshi and Malgus both have very similar approaches to the Sith Order, and to the peace treaty.
Haydriss tried to kill Rumun once, but bygones be bygones. Surely, there is no ill will between them. Right?