Perhaps its the way Vash starts to twitch in his sleep. Shifting more and more as the dream continues. Moving closer to Azwel as he unconsciously seeks out some sort of warmth and comfort from somewhere.

If the squirming doesn't wake Azwel the way Vash suddenly shits bolt upright and reaches out an arm. "Tesla! Don't hurt-- her..." He trails off gasping for breath. Looking around and letting the change in scenery hit him.