Yeah, Godzilla basically beats the the shit out of Kong and leaves him to die. Like, he could have finished him, but he leaves him there to... slowly die in agony, I guess? Then human man has the idea to use one of their futuristic hover vehicles as a makeshift defibrillator to kickstart Kong's heart and save him. Uh?
Meanwhile, Godzilla is being absolutely wrecked by Mecha Godzilla, and when Kong shows up to help I'm pretty sure there was a reaction shot of Godzilla looking mildly confused as if to say, "Huh? Thought I killed you. Oh well, guess it's good that I didn't." Kongzilla double-team Mecha Godzilla -- THE END.
There was really very, very little thought put into any of it.