Based on a leaked cutscene

You and Firefly were just walking at the Reverie Hotel Lobby, as she smiles.

Suddenly a giant scorpion-like insect appeared within thin air behind you, it charges behind as you quickly duck to dodge it. But when you looked up the insect flipped Firefly into the air and stabbed her in the chest as tears run down her face.

"S-Sorry..." Is all she could say before dropping to the ground, her body dissolved into water, splashing onto the ground.