Gretel chuckled faintly at the desk comment, but said nothing. Hopefully that didn't happen, only because she hadn't exactly tested this trick out with anything damagingly heavy. She watched Emma raise her hand, then tracked the bucket as it twitched, and promptly launched itself at them with twenty little projectiles.
And each one not only struck an invisible barrier about a foot from their faces, but was reflected back with considerable force. Same with the bucket, which clunked back against an empty desk and rolled off the other side.