Which phase is NOT part of the four phases of blast injury?

The four recognized phases of blast injury in the context of explosive events include primary, secondary, tertiary, and quaternary blast injuries. Primary blast injuries are caused by the pressure wave created by the explosion, secondary injuries result from projectiles that are propelled by the blast, tertiary injuries occur when individuals are thrown by the force of the blast, and quaternary injuries encompass other trauma or sickness from the explosion, such as thermal injuries or chemical exposures.

The option specified as "Residual blast" does not correspond to any established phase of blast trauma. Therefore, identifying this option as not representative of the recognized phases of blast injury is accurate, as it is absent from the framework of blast injury classification. Each of the other choices aligns with documented mechanisms of injury related to blast exposure, thereby reinforcing the reasoning behind the selection of this particular option.