Caroline took all the people in the supermarket as hostages because Bree told her that her husband had an affair. So she actually went to the supermarket to shoot her husband (who is a manager there). To those who didn't catch the previous episodes, Nora was the BITCH who tried to steal Lynette's husband.
Bla bla bla..
Caroline: You and your friend are really starting to bug me.
Lynette: She's not my friend.
Nora: She's trying to steal my kid.
Lynette: Nora, SHUT UP!
Caroline: Is that true?
Lynette: No! I.. were.. We had.. We are sharing custody, and then, then, she tried to seduce my husband, so..
Caroline: She put the moves on your husband? Why didn't you say so?
And *BANG*
Caroline shoots Nora!
Lynette gave her a very very shocked look.
Caroline: I believe the phrase you're looking for is "Thank you"!
Wah! Stylo man! I hate Nora!! And yeah, she died. :)