The sky became brighter, and Nick's ability deactivated.
As soon as his ability deactivated, Nick charged away.
The fact that the sky was getting brighter did not necessarily mean that something was going on with the Sun.
It might be that Nick was being attacked by something or somebody who used light as a weapon.
In almost an instant, Nick turned into mist and dove into a cave.
As soon as he entered, he charged towards the ground, his mist eroding the ground and creating a hole.
When there was no more light illuminating his body, Nick felt his ability reactivate, which multiplied his speed.
After charging for another kilometer below the ground, he stopped.
Since his ability had activated again, it meant that Nick was no longer being perceived.
