Which word best describes the mood in this excerpt from little brother?

he slammed his hand down on the desk and then pointed his finger at me. "the problem, mr yallow, is that you've been engaged in criminal conspiracy to subvert this school's security system, and you have supplied security countermeasures to your fellow students. you know that we expelled graciella uriarte last week for using one of your devices." uriarte had gotten a bad rap. she'd bought a radio¬jammer from a head¬shop near the 16th street bart station and it had set off the countermeasures in the school hallway. not my doing, but i felt for her.

aggressive
hopeless
suspenseful
playful