RHI crisis a major test for Executive and power-sharing at Stormont - how will it play out?

It was one of the most dramatic days Stormont has ever seen as politicians got hot and bothered over the botched RHI scheme. The First Minister was asked to stand aside over controversy, Speaker Robin Newton faced questions about his role and the DUP were left alone in the chamber as the other parties walked out when Arlene Foster started to speak. That dispute was the result of a stand-off with Sinn Fein, after Martin McGuinness said Arlene was not speaking with his "authority or approval" after warning of "grave consequences" if the DUP did take the unilateral approach he is pushing for. So where does this go next? Stephen talks to Sinn Fein MLA Conor Murphy and UUP leader Mike Nesbitt.