Lan Wangji is fairly certain that playing the notes of inquiry without actually trying to play inquiry doesn't invoke spirits, as he has taught those techniques to the juniors himself. And it would be a madhouse if every single time they all played, the spirits were expected to come answer.

That is, unless the Queen has given them something specific too. And - he is sure they are deaf to him, because he has attempted to play Inquiry at the hotel and he is unable. He always thought it had to do with his core, but somehow, Wei Ying is able to play it without--

--Well possibly, he has another Lan core. But Wangji has always thought if his brother were to pull Bichen for any reason, that Bichen would yield to his need. He would not do so, after all, unless it was very important.

There really wasn't any other way to check.