I think this mission is about pace. I am a level-headed gamer so finding the scrubs was practically 2nd nature. When I got into the room, knowing that the display of weapons would have started a gunfight to begin with made me hesitant to pull a gun out. So I just used a melee hit to destroy the life support machine after being unable to hit the target with the bat. As soon as I realized that the mission was complete. It was a good ol' sprint for the door before anyone realized what I had done. The wanted level still comes regardless because the cops aren't complete tards. I might try a stab in the future.