Sheryl's question made Tyler's heart skip a beat.
There were two reasons for this; one was that Sheryl had discerned their intentions, and the other was that she had asked about "you all", not "you".
In other words, Sheryl probably had deduced the relationship of common action between Tyler, Heloise, Vanessa, and Garvit.
(Truly impressive... Sheryl, who became the Chief Court Magician at the age of 28, really is formidable.)
However, Tyler read from Sheryl's mind that she was not entirely sure, so he did not intend to confess just yet.
"Lady Sheryl, why would you ask that?", Tyler countered.
"Isn't it about time to stop playing mind games with me, Felix? You must know about Wallace Azure Lizard resigning his captaincy and leaving Delis Town, right?"