That's physical injury of high velocity projectiles (fragments, or "frags"), vs. concussive pressure. The concussive pressure is the "pressure wave" from an explosive. It essentially breaks cells apart and disrupts tissue. Not unlike killing a bunch of fish by dropping a stick of dynamite into a lake. Also a reason for nosebleeds, when shallow capillaries easily rupture. It only takes a dead-stop collision of about 35 MPH (miles per hour) to separate the aorta from the heart. That effect over an entire body is devastating. Hence the "75 meter" perimeter around the suicide vest victim, and previous suggestion, "you can't get far enough away". The amount and type of explosive determines the blast and kill radius. The blast radius may include all injuries (high velocity projectiles, frags), while the kill radius is the distance that will kill a normal person, even if not struck by anything but the explosion pressure itself.
Life is tough, but it's tougher when you're stupid.
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