Solarii Fortress - Crossing the Palace Rooftops - Part 2

Move forward (southwest) along the only clear path across the rooftop. Turn right at the corner, continue forward and ride the zip line down to the next roof.

Another explosion billows out of the doorway ahead. As it subsides, take cover behind the low wall on the outside edge of the walkway because a pair of Solarii start shooting and throwing dynamite from the building across the way to the south—the one with the rough climbing wall.

When you've taken care of them, search the bodies on this side of the gap, pick up 2 bunches of arrows in the corner.

Then take a running jump across to the building where the shooters were. It's a long jump, so prepare to press Interact to steady Lara's grip on the opposite ledge. Use your axe to scale the climbing wall, loot the bodies here and then enter the building.