The first chimera fight in the Praeses' residence? You should have a 'submit' option along with 'retry' and 'exit' - choosing 'submit' is the only way the game can continue from there. No chimera fights can be won; but that first encounter is the only one that goes to a pseudo-game-over screen instead of just continuing normally - originally in the demo, you had to die multiple times for the option to show up to channel more of the unskippable boss cutscene frustration, but that was changed in the full game.