Sanity Killer

You take out the set of shruikens Elmo stole for you and hide in the shadows, throwing them at the ninjas. They cry out in pain and fall through the roof, breaking through the glass. Okay, so you've taken out the ninjas but the alarm has gone off. Police storm the place, arresting the ninjas. Security is tightened as more guards are set up in case more ninjas arrive. Okay, so your task is twice as hard. What do you do now?