I really enjoyed the puzzle being included. I understood the arrow was showing me that I had to go anti-clockwise in the room, but on my first try I counted the lockers from left to right even having understood the anti-clockwise clue. So I kept trying and on my third time I got the answer.
What I actually loved about it was that the character wasn't necessarily supposed to know the answer so it felt right that I had to experiment with a few different lockers before I got it. I enjoyed the continuation of the story and the small reactions when I was getting the wrong locker and the eventual pat on the back when I got it right. I assumed Emerson would eventually tell you which locker was yours and the story would have continued so the puzzle wasn't a dead end if you couldn't solve it.
Great work, I really enjoyed this chapter!