Realization: if Percy hadn’t gone outside to get Vex, the Pit Fiend would have bitten her unconscious fifteen feet from the mansion. Even if Keyleth had gotten to her to cast Protection from Poison, she was unconscious. The Pit Fiend could have crit-killed her. And even if Scanlan brought her back to consciousness, Vex wouldn’t have been able to move by the time her turn rolled around because the Pit Fiend would have his opportunity attacks back. A mace to the head and she’d be out again. And then - four attacks from a Pit Fiend.
I think Percy actually saved her life?