Everyone has already said everything that needed to be said about the whole thing being stupid, her not being smart, not needing to jump in, not needing to reveal her secret that was SO important it NEEDED to be secret for so long.
But i want to add that the dude had a knife, on the third floor. Like whats the threat here? Whats he gonna do? THROW the knife FROM THE THIRD FLOOR?
Even if we pretend these are expert assasins, what? is his skill KNIFE SNIPER? He wasnt gonna land that shit.