KS Chapter 28 Ending
I was confused as most people are over the ending of the most recent chapter, but after going back through it a couple times, I think the part with Seungbae balancing on the pole was a flashback that takes place prior to the bar scene with him interrogating Bum. Just before it switches to that flashback scene, we see him balancing on his tip-toes behind the bathroom stall door, which just saved his skin from being caught by Sangwoo. We know that if Seungbae so much as tilted just a little bit, he would have bumped into the door and alerted Sangwoo of his presence.
After this, it transmissions to the flashback. His training with balancing on the pole paid off for him in that moment.
Well. Guess he must be glad to have been so prepared now.