The moment Klaus' outstretched hand brushes the crystal, a burst of energy shoots into his body. The crystal is searing hot, but the heat does not seem to bother him. It feels comfortable in his hand, perfect. When he looks over, he sees that Estraeah has also went for one of the red crystals.
Before he loses consciousness, he smells the faintest hint of smoke on the air. It is comforting, like the burning of logs on a winter fire. He does not feel himself hit the ground.