An example of someone who suddenly does a badass thing is Meji from the Errant Story webcomic.
(
http://www.errantstory.com/)
Now you need to understand the context a bit to fully grasp the awesomeness of her reply.
This a world where Elves have been hunting the Half-Elves for a long time.
And Meji happened to gain the powers of 1 of the Elvish gods.
With those powers she just saved the whole Elven race by defeating Ian, who had gained the powers of the other Elven god.
Meji and Ian are both Half-Elves (Errants) who survived that genocide.
This is the conversation:
Angry Elven Dude :
" NO! NO! we will not allow this!
Peregin Sarine, Virador Misa Paedagogosi, you must stop that half elf!
Right now, before she becomes as much of a threat as the other errant was!
Child, you have earned our gratitude for helping us, but if you think we will allow you to leave with what is left of our gods, you are sorely mistaken.
Surrender what you have taken from us and we grant you amnesty.
Refuse and we will hunt you and any who would give you shelter...
No matter how small our number may become or how many years pass...
Think about your next action well, child.
"
Jon:
"I'm just gonna go stand over there for a little bit... over there on the next continent. I mean."
Meji:
"Ahem...
763
There are exactly 763 elves still alive inside this mountain.
Some are scared, some are injured, some are buried under the wreckage and will soon die without aid.
But 763 are alive, at least for the moment.
I can tell because I can feel their heart beats... every single one... and yours too.
I want you to remember that...
And remember that I am NOT the half elf that attacked you today.
I'm not Ian because if you do something to make me or any half elf angry...
I won't show up here to kick up some dust and make a mess like he would.
You would simply stop...
Fall down dead as I END those heart beats.
And that will be that!
Now that we have established that...
I suggest you stop bothering me and go save the elves trapped in there while there's still time.
"
True colours always shine brighter within darkness. ~ WonderDrow ~