What is a common indication of blood blown out due to air pressure?

The common indication of blood blown out due to air pressure is fine blood spray. When blood is expelled forcefully, such as from a gunshot wound or a severe injury, the impact of the air pressure can create a mist-like spray pattern rather than forming larger droplets or pooling. This phenomenon occurs because the force causes the blood to break apart into smaller particles, resulting in a fine mist or spray. Fine blood spray patterns can provide crucial information during a forensic investigation, helping to determine the nature of the injury and the position of the victim and shooter at the time of the incident.

While internal bleeding would involve blood escaping from blood vessels within the body, it does not specifically relate to the dynamic process of blood being sprayed outward due to air pressure. Other options, like blood trickling, typically indicate a slower and less forceful release of blood, and blood pooling refers to the accumulation of blood in one area, rather than the dispersion that occurs with air pressure.