With all respect to some of the other commenters, I find that being a reactive type is less about "freaking the fuck out", and more about sensing the negative and unspoken emotions in others (eg, hidden sadness, aggression, tensions, deceit, unresolved emotions, etc) and then reacting emotionally to that.
"Reacting emotionally" doesn't necessarily mean having a full-fledged meltdown. It can (I've had my moments), but it can also involve retreat, withdrawal, calling people out, asking questions, moving behind the scenes, etc. Reactive types don't necessarily want to create drama, they want these unspoken sticking points resolved...I suppose ultimately so that human beings can engage with each other more fully, with fewer lies.
Reactive types also want to be met emotionally--for others to realize that what they perceive is real. "Don't you see X happening? This is awful! I'm upset about this, and you should be upset about this, too!" Too often competency and especially positive outlook types would sooner overlook these dark undercurrents.
And so if there's drama to be created by the reactive triad, it often has its origins in this dynamic. At least in my own case, I find that my worst behaviour has come when my Type 9 parents simply acted oblivious. Clearly this bad thing was happening in front of their eyes and...la di da, they somehow didn't see it. So, I'd have to redouble my efforts to get through to them, and redouble them again, until I'd get in trouble for being a criminally insane brat, and the conflict went unresolved. To this day, they still think I'm the bad guy, and I still think they're soulless slugs (I'll leave it to the reader to determine which is the truer perception).