So we decided (well, bum did) that someone should claim RB so that the town doesn't figure out that that's how we knew LD was SK.
So Barundar did, and then LD was informed of unsuccessful RB.
But yeah, normally, mafia shouldn't have to claim RB, unless they were RBed by town or something. Normally, we could've tried to lynch LD based on clues and such, without letting him know who mafia was. But he was too favored by the town-folk to do that in a reasonable time.