Rulk plain murdered OF Thor, no-sold Thor's best hammerstrikes (to the face, no less) and basically outclassed him as if he was Thor's father.
That same Rulk struggled to gain superiority over Savage Hulk, and was himself utterly dominated and casually dismissed by WWH. TKOed by a thunderclap!
There's nothing Thor can do that will affect WBH in the slightest. And everything Thor does will drain Thor, so Thor has no chance. Attack and Hulk just dismisses him, defend and Hulk simply crushes him, run and ... well, that's probably Thor's only sane strategy, retreat to Asgard!