Click here to reveal spoilers for Dragon Age: Origins.
If the Dwarf Noble decides to challenge the honor of Mandar's father, Ronus, there will be a proving fight against Mandar to defend House Aeducan's honor, while Mandar fights on behalf of House Dace. This fight will also be watched by several other heads of major noble houses as well as the Dwarf Noble's father, King Endrin Aeducan.
Mandar is wielding a massive maul and the fight is to the death. When Mandar is defeated and killed, Ronus apologizes and leaves in order to mourn his son who fought for his honor.