What happens instead?
When Gaius leaves Rhue and Kloe behind, Kloe walks over to stand next to Rhue as always.. If you haven't got a good relationship with Kloe, Rhue tells her that he would like to be alone; if you have a real god awful relationship with her he simply says Go away!
Either way Kloe leaves Rhue alone, I think theres some different text here with Rhue just thinking to himself. Then you have the same end credits, just with Kloe missing from all the rest of the shots (ie Rhue walking the way alone and then Rhue standing infront of the sword alone).
EDIT: eh yeah, what Xusa said...
By the looks of it, theres also a slightly altered ending for a couple of things... Just a sentences here or there... Or just a expression different...
Looks like losing to the PS in the plunge changes something.. I tried to lose on purpose (Which is actually quite hard ^_^ ) and tried to cheat my way to a defeat (Never thought I'd have to do that)... But without changing much of the coding I'd still get stuck in this continous loop where the neither the PS or myself can win... Anyway if the PS beats you, I think the plunge is suppose to continue until you win, but after that the ending gets altered (although it might be no more then just the expression on Rhue face when he's looking at the sword that is different)...