Trowa makes the educated assessment that X does not need a spotter -- she may fall, but it's not that far, and there are mats -- and also that she does not need the complication of somebody else on the wire just yet.

Accordingly, he strips off his own shoes and socks, and heads for the opposite pole. He'll climb to the small platform there, and wait.

Sometimes a demonstration is useful. But X can give it a go on her own first, if she wants.