The man on federal death row for the racist slayings of nine members of a Black South Carolina congregation was wrongly allowed to represent himself during a critical phase of his trial, his attorneys argued Tuesday, saying Dylann Roof’s continuing “delusional belief” he’d be saved by white nationalists — but only if he kept mental health evidence out of his defense — should have shown his trial judge he wasn’t competent. Before a three-judge panel, Roof’s attorneys argued that an appellate court should vacate his convictions and death sentence, or remand his case to court for a “proper competency evaluation,” something they argue wasn’t done during his trial in 2017.