When that plane was detonated, passengers were disembarking in an orderly fashion because they had only heard an announcement about a technical malfunction that temporarily prevented takeoff. They were informed that the plane needed to be inspected, and only after the inspection could it take off normally. Hence, the evacuation at that time was very orderly.
This orderly process resulted in a relatively slow evacuation, so the passengers were completely unprepared when the plane exploded.
Those who had already left the plane were better off. The passengers just stepping onto the gangway were swept off their feet and sent flying into the air by the shockwave from the powerful explosion.
Fortunately, the passengers who could afford to fly during this period were somewhat wealthy and willing to spend money on nutritional supplements to boost their physical health. Consequently, even if they fell from the sky, they were mostly just injured, with no life-threatening harm.
