You're a tough kid. 'Jaden', that's what he called you, right? 

Listen, Jaden... I know we just met, but *believe me*, we need to stop this man. Because if we don't, life as you know it... well, *won't* be as you know it! *My* time, *your* time, it will all change! And trust me, it's not a change for the *better*. 

I know. My guess is, he hopped back in time to the era when he makes his big move, when he changes history and alters the future forever.