He turns his gaze to the beach beneath their feet and selects a flat, smooth stone and gestures for Wanda to come closer.

"Here, see - hold it in your hand like this," He instructs, showing her the way he cradles the stone in a particular way. "And make it a fast, low throw - flick it sharply with your wrist - like this..."

He whips the stone out across the lake for a four-step bounce and beams at the result.

"No superpowers needed."