Weiser_Cain said:When/how/why did this happen?
Wikipedia talks about DS being too popular to kill
Maxwell Lord was using mind control on Superman, and he beat the crap out of Batman. This is leading up to Infinite Crisis when Wonder Woman then snapped Lord's neck.
And it's happened several times where they have fought an dBatman hasn't been killed easily. Although, at elast in the other times Batman usually has been planning to fight Superman, so he could prepare a plan to beat him which at least makes it a little more believable.