Once the mission starts, run to the restaurant's basement where you cut the gas off. Grab the restaurant outfit and quickly run to kill the Red Dragon Negotiator. Dump him in the sewer, grab his amulet, and climb out. Next, head back to the basement. The guards will not know that you are not a restaurant employee. Cut the gas. Hide in the room where you got the outfit from and wait for the chef to go over to the gas thing. Quickly, yet quietly, exit the room and get behind the Chef. Note: Make sure you have the syringe out before you walk out the room. Just when he turns his head and spots you, stab him with the syringe. If done correctly, he should stand up and slowly walk away, leaving you in the motion as if you stabbed him. He will walk out the door, and get knocked out there.
