Arvin when understood that he can no longer stay here, he got up on his feet. He leaped towards the door. First, he tried to pull the door to see whether it is open or not. But that door was locked and close from the outside.
Arvin then thought that maybe he should just blast his way outside. So he weaved a magic circle and was about to fire a fireball at the door. But he stopped in the middle when he saw that the runes of the wall had started to glow. He remembered that when he was tased in his cell, the runes of that wall too started lighting up this exact same way. He didn't have the time nor the patience to be zapped by lightning again.
So canceled the magic circle. And as he did that the runes on the wall also stopped glowing. Arvin's room could still feel the tremors from the fight outside. He had to hurry before the tremors stop. Because as they would stop and the battle would be over then there was no guarantee that he would be safe here.