Here’s a short guide on how to complete the complicated Blood Channel Maze in Shadow of the Tomb Raider.
Shadow of the Tomb Raider: Blood Channel Maze
Shoot an arrow between the two pillars and link them together. At the next pillar, there is a turning mechanism, so you must pull it towards you until the platform you are standing on locks into place and the channels line up.
You want the three channels between the first and second discs to line up, and the third channel on the right hand side of the second disc to align too.
Go up the stairs on the right and shoot the white rope on the left hand side with an arrow and pull the rope. Then push in the lever on your right which will release the fiery flow.