He is in "alarm reaction".
This is the stage in the body's reaction to distressing jolts, portrayed by physiological changes, for example, expanded hormonal movement and expanded heart rate. There are three phases of stress: the alarm, resistance and exhaustion stages. The alarm stage is otherwise called the battle or flight phase. When you're in the alarm stage, your heart pulsate quicker, sending more blood to your arms and legs in the event that you have to fight or flee.