Liam and Henry fight security guards as Banks calls for the (not)nurses. Arthur and Norma subdue a nurse with Dr. Lewis' help. Dr Lewis activates the sleeper entity within Dr Stuart and asks her to helps Arthur's friends. It, instead, escapes up the elevator with the other possessed patients and re-releases the nurse back on Dr. Lewis.
Banks gathers what intel he can and drops a grenade to destroy the rest just before escaping. Liam throws the grenade wide as Henry picks it up and runs at both appearing nurses, succeeding at a most glorious jihad against them. Henry reforms in front of Liam, much to Liam's dismay. The sprinklers turn on, but turn off unexpectedly.
The possessed patients get passed Liam and Henry but Dr. (not)Stuart is apprehended when a warning comes from Arthur over the radio as Norma subdues the nurse with one of Lewis' control tokens. They team exits as the Institute is really on fire.
The plummers arrive with Ms. Murphy. Norma halts the possessed patients attacking the escaping normal patients. Everyone is exorcized. Dr. Lewis is then killed with a sniper shot. Arthur insights the shooter, Banks, and Henry hits one hell of a headshot.
Getting back to London, the team is debriefed and told of Karen's exoneration and that they can get a late start the next day. Angleton reminds them of the individual assignments they all have due in 2 days.
The next morning, the team have a meeting after breakfast including a very ungrateful Liam who should really put a sock on his doorknob if he doesn't want to be disturbed. They all reveal they are investigating each other and what they know of their powers.
Liam shows everyone his A.I. Arthur gets word of the excavation of the cave he and Dennis were attacked in. Henry is informed of a therapist house call for later this evening.