Fight or flight? The basic instinct kicks in, and either way, mayhem ensues. It all depends on the personality of the character involved. Will they stay and fight? Or, will they "get out of Dodge?"
In the grand scheme of things, it doesn't really matter which path is chosen. However, what happens next for our protagonist is solely dependent on the choice made. Besides, the choice may have to be made many times. Will they continue to do one thing or change their tactic?