You've got to go all the way around, back to the beginning of the level, and then on to the little ninja hut where you will find more ninja's chilling. You can't take the easy way to the hut by going through the gated entrance. Once all the way around, you should see the little bridges in that area where channels are cut out leading to the ninja hut. Fall into the channeled areas and make your way under the ninja hut, where you will hear the ninja's talk about the new meeting location. Once heard, kill the ninja's if you want, then make your way back to the contact and finish the first half of the demo! :P Hope this helped..