They also progress through the effects of critical incident stress at different rates. Symptoms experienced may vary. Accept your own feelings and reactions to the incident as well as those of others. There is no wrong or right way to feel or think. Your reactions are valid.
Most people do the best that they can at the time of a critical incident.
It's natural for you to feel that you could have done something to lessen the impact or prevent the incident. This is probably unrealistic. Don't take too much responsibility for the incident or the way it went. Don't be too harsh on yourself. You have experienced or witnessed a traumatic event which no doubt will affect you in some way.