The moment Klaus' outstretched hand brushes the crystal, a burst of energy shoots into his body. The glow of the crystals grow brighter, making his eyes sting. When he looks over, he sees that Estraeah has also went for one of the white crystals.
The last thing he feels before losing consciousness is a deep thrumming in the air, as if he can now deeply sense the world around him in a way he never could before. He does not feel himself hit the ground.