Final answer:
The fragmentation phase of an explosion is responsible for flying debris and bomb fragments that cause lacerations or penetrating injuries.
Step-by-step explanation:
The question asked is: Which phase of a blast results from flying debris, projectiles, and bomb fragments causing lacerations or penetrating injuries?
The phase of a blast resulting from flying debris, projectiles, and bomb fragments that cause lacerations or penetrating injuries is typically referred to as the fragmentation phase of an explosion. During this phase, pieces of the bomb's casing and other objects nearby are accelerated to high speeds, turning them into potentially lethal projectiles. These fragments can cause severe trauma on impact with the body, leading to injuries that require immediate medical attention.