If the startle response is strongly elicited through surprise then it will bring on the fight-or-flight response, which is a perceived harmful event, attack, or threat to survival that causes a release of adrenaline for a boost of energy as a means to escape or fight.
If a startling event elicits a strong startle response, it will trigger the fight-or-flight response, which is perceived as a harmful event, attack, or threat to survival that causes the release of adrenaline for an energy boost to escape or fight.