Apollo let Rosario get away— well, he let her leave.
Cin had been a little like this at first too, prickly and suspicious and wary, and now look at them. All that had taken was time (and okay, thousands of dollars worth of wooing and one murder, but mostly time.) Rosario just needed time too. Time, and proof that he wasn't an asshole out to fuck with her, proof that he only wanted to help her.
Rafe and Trip were waiting for him at a table they'd colonised at the back of the lab, both of them erupting into deep into cries of "Yo! AG!" and "my man in da house!" when he walked in, dead on the stroke of two. Apollo grinned at them, slapped Trip on the back, and gave Rafe a fast series of complicated fistbumps.
Professor Molloy lifted his head from his computer, now successfully projecting the first slide up onto the screen behind him, his face brightening in a moment of nostalgia when he saw Apollo's face. "Alright, gentlemen, take a seat please, we're about to begin," his voice humouring them all more than he might have done, if they were anyone else.
"You got it," Apollo threw an easy salute at the man he'd mentored through his own college years back in the seventies, and slid into the empty seat next to Rosario.
Apollo wouldn't be Apollo if he let people just... get away, after all.