This was the cooling-off period after a successful defense of the arena.
If the defenders were allowed to continually accept challenges from other competitors, they would eventually be worn down by the relentless battles, regardless of their strength. At some point, they would be exhausted, which would be unfair to the defenders.
Therefore, every time a defense was successful, and the light film rose, the Sky-touching Mysterious Wood would release its power to help the defender recover quickly.
Before the light film dissipated, the challengers were not allowed to enter the arena.
Of course, this recovery was not endless, and the light film could not last forever.
If the injuries were too severe or the exhaustion too great, and the defenders had not recovered during the appearance of the light film, they would ultimately have to leave the arena dejectedly.
About three minutes passed, and the light film quietly faded away.