FormerlyHemlock
Hero
I still don't understand how he gets two attacks.
He can use his action for the attack action. That's one attack.
He's left using his bonus action either for an extra hand crossbow attack thanks to the crossbow master feat OR using that bonus action to take the Hide action via cunning action (presuming the Dungeon Master uses a liberal interpretation of the stealth rules and allows him to attempt to hide every single round).
Yes, we have covered that exhaustively back on page 4 of the thread. The player was doing it wrong (using his bonus action to attack w/ Crossbow Expert and and also using Cunning Action to attack (presumably a Fast Hands Thief)) and the DM didn't know better but does now. No need to beat a dead horse. Moving on...