There has been a clear trail of violence up here, Gallagehr, as Rundell has been blasting elft, right and center. The lift itself does not go up to the roof; you and Korth have to take stairs from the top floor.
It is just beginning to get dark outside, and Thespia is a windy world; a strong breeze blows at you, catching your Padawan locks and billowing your cloaks.
Your sister is there, at the edge of the roof, Rundell with a gun to her head.
"Rundell!" calls out Korth, yelling above the wind. "There's no point in this! The only way out for you is to let her go! Her death won;t bring you anything now!"
Gallagher comes to an abrupt halt beside Master Korth as the situation becomes very plain. He sees the gun pressed to the side of his sister's head, the desperate man holding it there. He studies his sister for a moment, wishing they had met formally under different circumstances. He sees himself, genetic features that run in his family, within her. His flesh and blood. His sister.
"I can guarantee that no harm will come to you if you release her!" Gallagher says, reaching out to Rundell's mind with the Force. He uses Empathy to get a feel for the situation, suspecting that Korth has already done so. "Please, let her go!"
Rundell is tall and blonde; your sister medium height with flowing dark hair- flowing even more in this wind, looking almost as if it might carry her over the edge,
"No closer! No closer!" yells Rundell. "Thuis is wrong... all wrong!"
"It's no good," says Korth to you, as quietly as he can. "His mind has gone."
Which is indeed what you are sensing from him.
You can't talk quietly due to the wind. Korth gives a slight jerk of his head towards the side of the building, to the side of RUndell.
"Tell me what's wrong, Rundell. There's no way you have enough friends to use that compound. Someone else told you to use that. Is it that person who has steered you wrong?"