Bug, maybe?

I was trying to clear the 'Impregnable Fortress' again today and fell into a pit trap... As I continued, I found about three enemies, like sentinels, blocking the path and facing the other way, completely frozen. I thought I was stuck because if I hit them and lost, I'd be sent back to the same spot before the stairs, but after restarting the game, they started moving normally, which was a relief. Thinking back, I could have just used my Haken piece to solve it instantly lol