After the opening cinematic, follow the guard down the hall and around the corner.
When prompted, head through the nearby double doors. Turn on at least three of the room’s eight showers to trigger the next objective.
Approach the sinks along the back wall, then grab either of the weapons from the nearby bench.
After the cutscene, attack the sequestered prisoner. Follow the on-screen instructions and continue your attacks to complete the encounter.
When you regain control of Murphy, follow Officer Sewell through the prison block.