There has to be a sc2 for these two reasons. This is the exact dialouge from the scenes that clue you on sc2.
1.First Raynor after Fenix dies in Korhal by Kerrigans forces
Raynor: Fenix, no! Kerrigan are you mad! How many more people have to die until you reach your mad quest for power! How many more must suffer from your betrayals!
Kerrigan: Enough Jim, he died as any Protoss warrior wanted to, in combat.
Raynor: He died because you betrayed him! Your going to pay for this Sarah.
Kerrigan: Tough talk Jim, i dont think you have what it takes to be a killer.
Raynor: I am going to kill you Sarah. It may not be today or tommorow or even with an army behind my back, but I am the man who is going to kill you one day, I'll be seing you!
2. Zeratul's visit on the Dark Moon
Duran: Magnificent isn't it.
Zeratul: Who are you!
Duran: I have had many names throughout the millenia, some call me Samir Duran.
Zeratul: Hmph, Kerrigan's consort, is this part of her twisted schemes?
Duran:No, young Kerrigan isn't capable of creating this grand experiment. Though he control of the Zerg Broods have quickened my work, she is narrowly aware of these cells.
Zeratul: If you are not Kerrigan's lackey, what are you!
Duran: I am a servant of a far greater power that has hid for countless ages. Its power is reflected in this cell.
Zeratul: Have you any idea of what you've done...do you know what this hybrid is capable of!?"
Duran: Of course I do, young prodigal. Behold the power of you're history."
Zeratul: All I behold is an ambomination.
Duran: Young prodigal, you may believe this is a failure but it a weapon strong enough to phase worlds. You may destroy all the specimans here it will do you no good...for I have seeded the Hybrid over many worlds. You will never find them all before they awaken, and when they do you're universe will be changed...forever.