Corrected entry: Mika needs to be protected by Raizou because she's become the next target of the ninja. After she rescues Raizou from the attack at the police station, she and Raizou are sitting in the hotel room. The ninja have followed them, and Mika plants the tracking device on Raizou so we can get to the film's finale. We cut to the scene where all the police, the army, swat, etc. come rushing into the hotel, and we see Mika sitting calmly on a chair and she remarks, "You're too late, they took him ten minutes ago." Ok, but why didn't they kill Mika? That's was the entire point of the film up until now. Even though they were also trying to kill Raizou, they were still after her. She showered and smoked, but that really doesn't help when they followed your car filled with ninja stars. I doubt highly trained, mystical shadow assassins would miss her while she was hiding in the closet.
Correction: It shows her outside before the ninjas show up. While they could have still found her there, he was the bigger concern so once they took him, it was simply a matter of time before they caught up with her. She wasn't just hiding in the closet.
VIceroy794