TL;DR:

Mine and Rex's character walked into a group of 3 Papacy solders/mercenaries in a room in the second floor. Before we could stop them, they blew a horn that signaled an attack. The church is now under attack and some of the Republic's soldiers are traitors as well who blocked off the stairs to the second floor where 4 archers are and shooting down at the meeting. Oh, and me and Rex killed the 3 people, and are now trying to get back to the group.