Answer:
Tybalt is responsible for Romeo and Juliet's deaths because his insistence on fighting Romeo is what got Romeo banished and led to his death. Tybalt was so caught up in his family feud that he did not think about the consequences.
When something gives you a rush of adrenaline it hypes you up you get super excited, sometimes it triggers your flight or fight instinct if your in a dangerous situation. (Hope this helps)
