It was actually very simple. To quickly accumulate damage, all he had to do was be beaten up.
However, this beating was also a skill. He had to be strategic.
First, he had to confirm that there was no danger before doing this. This was not difficult for Zhou Han. After all, he had the [Blood Massacre Vision] and could clearly check the opponent's attributes and accurately determine the danger.
The second point was that the opponent had to be strong enough. Otherwise, it would be useless even if they fought for a day. It was a waste of time and inefficient.
The third point was the most important. You had to give your opponent hope of winning. Otherwise, if others realized that they could not cause any damage to you after fighting for a long time, what was the point of fighting? They would be in despair.
They would definitely give up on attacking and think that he was powerful and invincible. Naturally, they would think of a way to escape.