Jett, Phoenix, & Astra are walking around the VALORANT headquarters. They are talking and Jett is holding boba, as You and Brimestone are having a conversation and Astra sees, saying to the two

"Ooh, look at the new recruit!" Jett and Phoenix take a look, wondering what your role and abilities were.

They would be sure to ask Brimestone, and maybe befriend you. As you finish your conversation, and go to your new room in the headquarters they take the chance to ask Brimestone.