[quote=@Lord Wraith]
First thing that came to mind was something about if he's in contact with the ground but if he flies through use of his power then he's kind of always grounded without access to his abilities. But perhaps certain material or materials block or hinder his abilities. 
[/quote]

[quote=@Mr Allen J]
His power shrinks his dong.
[/quote]

Both interesting suggestions, but I chose to change his power entirely. It took me twice as long because after I first wrote it up, I accidentally hit 'Cancel' whilst previewing the edit. Because I'm kind of a genius like that.

Please let me know if you prefer this edit.