When the scene returns wait a moment and take out the guard that walks over to you. You can also pop out of the hay to the South and then get the guard with a corner assassination. Head to the Northeast after that. Take out the next guard that you can find there. Head up the stairs from there, staying in cover. Take a moment to lure the nearby guard by popping out of cover. When he comes to investigate, take him out. Remember, if you have the the Security Map you can see where the patrols are going and who is going to be where. Now you will want to take cover nearby the stone pagoda that you just killed the Guard under. Go to the outside of it and hide in the outside of the
Get into position for your strike. Now wait for Lafreniere to approach and start passing through the pagoda. Once he makes it to the center, you can easily strike.