The corridor beyond the door is very dark. The boar can see much beyond the light spilling into the corridor from the light of the torch one of the NPCs is carrying. With its low-light vision, it can see roughly 80 feet in either direction (the second 40 feet is shadowy illumination for the boar) from its spot on the map.
Thus, as per the battle map below, the boar can clearly see the cultist standing 30 ft. away from him, but the other two cultists are within shadowy illumination. Thus, they have concealment vs. the boar. The boar can clearly hear the two men to the south, but it doesn't hear the cultist to the north.
Once Caerth moves into the hallway, he can see all three men clearly and can note the other features marked on the map below. The two cultists to the south are running away from the broken door. There is an open corridor/passageway to the east of Cultist #2. The cultist to the north seems to be standing guard, but trying to stay quiet and hidden. Caerth can see the cultist clearly with his darkvision.
After Caerth attacks, Quinn will double move (for a total of 40 ft.) from his position off the map (two squares behind where Caerth was initially standing) to be in the long corridor. He will turn towards the sound of the boar fighting with the cultist.
So, at this point, you can't see any enemies. Beyond the dire boar, the two cultists have retreated, but you're not sure how far. The other cultist fled into the northern door and close it behind him. No one heard a locking sound, but the noise from the sound burst and the squealing dire boar filled most of the corridor.
The lesser NPCs will likely take their cues from Maur since he's in his element. However, Brutus seems to look to Caerth more and Timmins has his own strong will.
Aureus will work in conjunction with Phar first, since they have a long friendship, but is comfortable in her role to look for traps and watch the other's backs.
Okay, I'll update Maur's position on the map once I've completed my posts for round two.
What I'm going to do is separate the posts for Caerth and Quinn (PCs) from the posts for the NPCs.
FYI, Scott DeWar contacted me through Facebook and told me he will be back on EN World using a slightly different username at some point in the not to distant future. If he gives me any other updates, I'll let you guys know.