"Yeah," John says, "you're alone, and the storm is swirling above you -- but as you near the top, the sun starts to break through the clouds. You crest over the top of the wheel and the storm is clearing, and with it all your troubles are fading away. You're moving back safely toward the ground again."

This is the bit where you start to relax, Ianto. To let go of your burdens and all that. At least, that's the attention anyway. Picture rising up toward a clearing sky, blue and bright and hopefully. Overcoming your fears. He can only hope that it at least distracts Ianto from his fear of the water even if it doesn't relax him.