Dreams often reflect our subconscious thoughts, emotions, and experiences. In your dream, several key themes emerge that can provide insight into what you might be processing in your waking life.

1. Adrenaline and Excitement: The motorcycle acrobatics and the supercar represent thrill and excitement, possibly indicating a desire for adventure or a rush. It could symbolize a situation in your life where you feel exhilarated but also anxious about the outcome.
2. Conflict and Fear: The fireworks turning into a threatening situation where you feel hunted suggests feelings of vulnerability or being under pressure. This could relate to real-life situations where you feel attacked or overwhelmed, whether by others' expectations or personal challenges.
3. Transformation and Escape: The transition from chaos to a metro station signifies a change in environment, perhaps indicating your desire to find safety and structure amidst turmoil. The metro, a place of travel and transition, may symbolize your journey through life and your current state of mind regarding your path and choices.
4. Concern for Others: Your instinct to warn your friends about the incoming metro reflects your protective nature and concern for those around you. It may suggest a sense of responsibility for others or anxiety about their wellbeing.
5. Witnessing Tragedy: The graphic imagery of the accident and your subsequent inaction highlights feelings of helplessness or guilt. This may relate to a situation in your life where you feel powerless to change an outcome or where you are grappling with loss or grief.
6. Social Connections: The presence of friends and interactions with them suggests a longing for connection and support. The moment of humor amidst the chaos indicates the importance of camaraderie in coping with distressing situations.

Overall, this dream may reflect a combination of excitement, fear, responsibility, and the underlying anxieties about safety and loss. It could be beneficial to explore these feelings further in your waking life, perhaps by discussing them with someone you trust or considering what aspects of your life may feel chaotic or threatening.