Before I go I leave you with some S4 quotage. Haha I love Jack's last line. :P
Irina: I'm not gonna torture you. I'm gonna let him do it. And he really doesn't care for you, especially after you tricked him into killing me. One thing you should know about Jack: he hates being anybody's puppet.
Jack (getting a syringe of the contaminated water): I'm actually hoping that you don't tell us what we need to know . . . There's a fifty-fifty chance Sydney cuts the right wire. I'm willing to take those odds if it means I can stand here and watch you turn into an animal.
Elena: You're not a gambling man, Jack.
Jack: I didn't use to be, but it's been a rather interesting year for me. It's made me reevaluate certain parts of my life. I'm trying to have more fun these days.
-Before the Flood Episode 4x22