Why Did Priors Wear a Mask?

Of the eight justices in the court room, seve of them apparently did wear masks. The chief removed his when he was asking questions ad then put it back on. And i think the others mostly kept theirs on. I don't have no confirmation of this, but my strong suspicion is that priors was on really badly, and that his nose was poking out the whole time. Some needed context for what is about to unfold. If everyone's wearing a mask, like, why are you not wearing a mask? Oiousy. He's making a statement.