As we speed towards the end of Pretty Little Liars Season 4, Spencer is starting to think she may have hurt Ali on the night Ali disappeared. So, for today's Flashback Friday video, we figure it's a good idea to take a look back at what we know did happen between the girls that night: a verbal argument about Ian.

In this flashback that we saw on Season 1, Episode 15 ("If At First You Don't Succeed, Lie, Lie Again"), Ali and Spencer are arguing. Ali tells Spencer that "by tomorrow morning, Melissa will know everything," by which Ali means the fact that Spencer and Ian kissed. "There's nothing you can do about it but let her hear it from you, first."

"Fine," Spencer agrees. "I'll tell her. You win. But this is it. I'm sick of your games. We all are."

Ali responds by telling Spencer "it won't work." "I made you, Spencer. I made all of you."

This is the moment where Spencer seems to realize that Ali is just too much. Ali may think she controls the Liars, but, as Spencer says, "What is a leader without followers?"

Oh yeah, and she says this little tidbit: "As far as I'm concerned, you are dead to me already!" Did she go on to try to make that statement literal?

You can watch that dramatic scene here.

Catch the next episode of Pretty Little Liars Season 4 on Tuesday, March 4, 2014 at 8 p.m. ET on ABC Family.

Rebecca Martin is an Associate Editor at Wetpaint Entertainment and our resident Game of Thrones, Breaking Bad, and genre TV expert. Follow her on Twitter and Google+!