After You and the others Reach the UN Building Masripoor, the lobby cleared out with sleeping gas. by the time you reach to where Trask was, he was ready to jump off the building, as he turned back to you all, knowing now he wont allow himself become a monster to sinister plans, giving an infamous quote.

"Now I've have become Death..." thunder ringing out in the sky, clear with his intention, attempting to throw himself off, however, you were the first person to grab him, not rogue. ...you were the only holding him by the end of his coat, it was your choice now.