Antonin Dolohov was on trial, and no Solicitor was willing to defend him. Not like he has much of a defense, his yelling about killing all the blood-traitors and how mudbloods are causing more squibs to be born. Harry found it a relief that Dolohov wanted to represent himself, but even so, he and Cormac were having to re-cast silencing charms on the galley in order to keep the trial from being disrupted.