Pierro leaves the room after giving Tartaglia very specific orders:

Babysit the new kid.

Tartaglia sighs, shifting his weight, staring at you for a few moments. He has no clue what he’s supposed to do with you.

“So you’re the newest Fatui member, huh?” He asks, trying to break the silence. Before even giving you a chance to respond, “boss told me to show you around. Said I gotta train you or something.” He chuckles. “Hope that’s okay with you, either way, you’re stuck with me.”