I picked up this series after dropping it. It was a good choice - first two episodes were really weak, but after that it started to be great.

It seems that repeated time leaps have put strain on Okabe's mind. He isn't caring that much about relationships with people(instead of trying to save Mayuri, he would observe her death just to get the accurate time of death), and is getting more determined about the whole case. Punching Moeka is another case of this, heck his every action considering her was kinda forceful.

We also have to remember that Moeka has no idea if FB is connected to CERN... i mean SERN.