If anyone can make Louis see reason, it's Jessica. As the third name partner is PSL, when S & L starting throwing punches at each other, you've got to take a side. With Hardman circling the firm, we're going to guess that Jessica's side is the side of reunification in order to present a strong front.
Added:
More than any physical injury, Louis' pride took a hit last week, when he took those hits from Harvey. His relationship with Esther and with Harvey were called into question, so he's understandably feeling a little hurt. Can he see reason and learn to forgive his best friend? Should he have to?
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No matter what Donna says, it doesn't look like Louis is exactly in a forgiving mood. He took a punch to the eye and then a shove through a glass table. That's not something you just get up and walk away from. With bumps and bruises everywhere to remind him of his fight with Harvey, Louis won't be in the mood to forgive and forget for a while.
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Caught between her ex-boss and her new one, there's always a chance that Donna could side with Louis instead of Harvey. Even if he was provoked and his actions were understandable, Harvey still did some serious damage, and Louis and Donna are tight now. Could Donna be on Team Louis this week?
Added:
Once again Donna will have to work with both Harvey and Louis as they duke it out, and this time she'll have to pick a side and stay there. Nothing says "permanent damage" like an assault and battery charge, so hopefully Donna can get Louis to let bygones be bygones.
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These two ladies might not just be facing off against each other in the court room this week, and we can even forget all the drama about the fiancee meeting the ex-girlfriend. Mike's secret seems to be the main point of contention this week, and we can only imagine how upset Claire will be if she realizes that Mike has scammed his way into the legal world again.
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Rachel is looking very bridal in this photo, decked out in all white and gazing longingly into the future. Her future with Mike not be as rosy as she'd hoped though, if the truth about his degree ever gets out. Forget about losing his job, Mike could end up in jail and PSL could go out of business if he's exposed as a fraud.
Added:
Now that Harvey has recommitted to therapy and started discussing his mother, his emotion seem to be always right on the surface. Which is probably what led to him punching Louis in the first place. Hopefully Harvey can use these sessions to get a handle on his anger, or he'll be facing more assault and battery charges in the future.
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Suits Quotes

Sometimes good guys gotta do bad things to make the bad guys pay.

Harvey

The longer you go, the less the money matters. The food doesn't taste as good. The cars aren't fast enough. The view isn't high enough. And finally, you realize that you would trade it all in for one night of going to bed, where you don't have to worry, 'When are they going to come for me?'

Trevor