Make an inference Why did Percy run out of Mr Brunner's?

Percy likely ran out of Mr. Brunner's classroom due to a sense of panic or confusion stemming from the strange events and revelations surrounding him. Feeling overwhelmed by the unusual circumstances and possibly the pressure of being in a place where he felt out of place, he may have needed to escape to gather his thoughts. Additionally, his impulsive nature often leads him to act on instinct rather than pause to analyze the situation.