Ch. 7 "Everything that had happened throughout the day faded like that first false snowfall of the winter. Phineas was back."

I believe that this of course shocked Gene to see Finny in his room, but I believe that he was upset to see Finny there after all he had gone through. Gene was still trying to get over the guilt of hurting Finny, and I think he might have finally found a way to get over it by just thinking that he had accomplished his goal of making him not be so powerful over everyone anymore. I think that seeing Finny destroyed all the progress that Gene had made towards getting rid of his guilt because he is now reminded that he severly hurt his friend and did not even take him out of the picture. I think that Finny will be able to get forgive Gene for what he did before Gene can forgive himself.

How will Gene react in the long term to Finny coming back to Devon?