 Similarly, if a permanent judge is unable to sit, a non-permanent Hong Kong judge will sit in place of that permanent judge.Technically, should a non-permanent judge from outside Hong Kong be unable to attend due to extraordinary circumstances (such as during the 2019 coronavirus epidemic), two non-permanent Hong Kong judges may sit on the court.As the role of a non-permanent judge is not a full time role, a serving High Court judge may be appointed as a non-permanent judge concurrently, such as Vice President Tang and Vice President Stock, as they were then known.