The answer is "alarm".
The alarm stage is otherwise called the fight or flight response. Amid the alarm stage, your mind sends a crisis flag to different parts of your body, which tells those parts that you're in an unsafe circumstance. As your body assembles itself to respond, you can pick between a fight or flight reaction.
When you're in the alarm stage, your nervous system is set up to fight or flight. Your heart begins beating quicker, which gives more blood and oxygen to your arms and legs.