Place it right at the reveal, just after Enemy Spotted and just before the fight begins. Follow it with Danger Alarm Meme Sound once the boss attacks, so the sequence moves from warning to question to danger.
關於此聲音
This 1.8-second clip is one player asking aloud whether the huge enemy in front of him is really Minos Prime. The line sounds caught off guard, half question and half gasp, and it leaves the listener feeling the same sudden disbelief, as if a normal fight has just turned serious. In ULTRAKILL, Minos Prime is a Prime Soul boss met in the Prime Sanctums.