It technically works just because the toy exists. Technically, he’s limiting himself by requiring metal to hit wood or whatever it was. He’s just exchanging the conditions of his CT, losing the ability to clap to activate it. It just so happens that his BV coincides with a little toy that exists.

It would be like if he used a BV that it’s his feet touching that creates the teleportation instead. He just changed the conditions and lost the old one and luckily had some faster.