You can't really assume that Red only saw Joshua when he was at the top of the tower. To say "someone in disguise is a traitor" you need to have a direct line of sight so its highly possible that he saw you go in to the tower and then come out the top with a disguiser on. Also he didn't push you in the nether when you was in the t room, once you have been in there for 10 seconds it sucks you into the nether portal.

You can't really assume that Red only saw Joshua when he was at the top of the tower. To say "someone in disguise is a traitor" you need to have a direct line of sight so its highly possible that he saw you go in to the tower and then come out the top with a disguiser on. Also he didn't push you in the nether when you was in the t room, once you have been in there for 10 seconds it sucks you into the nether portal.