"Hey! What if someone just so happens to advance a level during battle?"
"Hm, advancing a level! Then that really is too incredible." Young Sir Ding said with a smile, "But since it is a competition, you of course have to continue competing to decide the outcome."
So? The person advancing was out of luck and deserved to get attacked by their opponent!
If there weren't any protective measures, the person who finally was able to advance a level might get ganged up on or even worse, get interrupted and experience vital energy deviation.
Wasn't the danger too great!
Young Sir Ding blinked his eyes guilelessly. "Who would advance a level in the middle of a competition? No matter what, there is a buffer period during level advancement."
In other words, even if you felt like you were going to advance, you could hold it off until the end of the battle. Then you could go find a quiet place to advance!
