justdessertsbygabe
Jim wasn't actually going to let Oswald stay and die by Maroni. He, in fact, get's fatally injured, going back to try and save Oswald (When he went after Fish). Oswald doesn't know this, so he still thinks that Jim wanted him dead. So when Oswald finds out about Jim getting shot-not knowing why- Oswald is conflicted, wanting to be smug, satisfied, happy that the one he'd trusted-who'd turned on him (He believed) was injured. But the over powering emotion of worry and this need to destroy whoever got the lucky shot in-because it had to be lucky with Jim Gordon- and torture them with all his power and influence
And when Jim gets well enough to go home, Oswald decides it's time for a little bit of payback. He goes to gloat about Jim falling from Detective to patrolmen, and Oswald's own success. He wants Jim to suffer. Will he find out the truth behind Jim's wounds, or will he remain oblivious?