The purple bolts of lightning struck down with the literal fury of the world and the intent to destroy every invader. The anger contained within the lightning was for one of the invaders in particular.
When the bolts of lightning struck the wall of water, they sank harmlessly into the water and did nothing to the guardian of water within the cylinder of water. But when the purple bolts struck Loki, they exploded and tried to burn him alive.
Unfortunately for the purple bolts of lightning, they were too weak to break his defense. So they could only wander all over his body looking for a weak point to enter through.
They could only consume his energy as he resisted them. They couldn't really harm him. This was the case no matter how much the guardian of lightning called lightning to strike him.
Again and again, lightning bolts fell on him. Again and again, they failed to stop him.
