Follow Haytham through the warehouse and try to find Benjamin Church. When you finally find him… well you didn't find him unfortunately. Fight your way out of your predicament. Similar to your last fight with Haytham, the men here will be a little more difficult than normal requiring you to use advanced counter techniques to defeat them.
With the fight behind you, the place will start burning down. Find the broken bridge and run up to get to the upper level. Turn right and start running along the beams to get across the room. When you get to the other side, follow Haytham to the right and down to the lower floor. Climb up the broken stairs and up the wall. At the top, jump backward to the lift platform swinging in the middle. Run across to the other side and climb to the top to help Haytham.
