Some guys have severe inferiority complexes. Wonder Woman can lift several tons, is incredibly fast, has advanced combat skills, and is impervious to a high level of injury while Bat Man is just a man with advanced combat skills. In a rational reality, someone like WW could easily kill Bats with little to no effort. Only when some fan boy needs to boost up their idols into something more do they have to embelish a story so that a mere-mortal could stand toe to toe with demi-gods. I can't figure out why this is. When spider-man shown to have no chance of defeating Superman, I wasn't disillusioned with his character and I wouldn't think less of Bruce Wayne if he wasn't able to defeat a woman with super human strength. I would be impressed that he would even try. But when you have to invent a story where he can defeat these heroes then all perspective is lost. Shoot, the Jimmy Olson could defeat Dark Seid in hand to hand combat in that type of reality. Oh yeah, I guess he did. If you have to chalk this up to something kinky so that you can preserve Bruce's man-card, I would imagine that if Diana so desired, she could tie him up and own his ass. And Bats would have to take it like a woman.
I can help with those wanting context for this picture! It's actually Batman's own fault here. The scene takes place in Greg Rucka's The Hiketeia. Being a huge WW and Batman fan he really wanted a sotry featuring both of them. Without throwing out a truck load of spoilers I'll just say that Wonder Woman is protecting a street girl who came to her Embassy pleading for sanctuary after she is accused of murder. Batman shows up shortly there after, hot on her trail since the murder took place in Gotham City.
Batman has a duty as an enforcer of justice to bring the girl to the police, Wonder Woman has duty as ambassador of the amazons to protest a woman who has requested sanctuary. Now, this was back in the 90s when Batman was... Well, pretty much he was an egotistical jack ass in the comics. He said if Wonder Woman wouldn't surrender the young woman to his custody he would take her by force. This went about as well as it would go if Bats tried to use force on Superman without a hunk of Kryptonite to back him up. He lunged, she knocked him back, then pinned him down. The don't get up part comes from them being such close friends, and her knowing good and well he's not the sort to back down from a challenge. She didn't want to have an actual fight with one of her best friends.
After this scene the whole story does play out really wonderfully with the two coming to work together to figure out the whole case. It's a great read but I'll warn any prospective reader that it does conclude in tragedy.
It really is an amazing story. It's a shame DC comics treated Greg Rucka so poorly, he's one of the few writers in the industry who could write about the these characters without letting fanboy-ish desires interfere with telling a good story.