In 1641 Hall was translated to the See of Norwich, and in the same year sat on the Lords' Committee on religion. On 30 December, he was, with other bishops, brought before the bar of the House of Lords to answer a charge of high treason of which the Commons had voted them guilty. They were finally convicted of an offence against the Statute of Praemunire, and condemned to forfeit their estates, receiving a small maintenance from the parliament. They were immured in the Tower of London from New Year to Whitsuntide, when they were released on finding bail.