Tough Girl Christine

This may be just me and I'm fine with that but Christine's tough girl act was annoying. The whole movie she had that act going and the save-Kira act was really bothersome. Was there some deep bond between them we didn't know about?

There was one scene when Michael had his hands on Kira and Christine came in on them and yelled, "Let her go!" Of course Michael didn't obey this command. But... when Christine yelled, "I said *beep* let her go! Now!" he complied.

So did she really mean it the second time? Is there something about Christine we don't know that when she swears she means business? There was no threat of physical harm, no threat of snitching just more emphasis.

Trivial thing I know but it had me rolling my eyes.