Right here
http://www.youtube.com/watch?v=BHV1ScVoPZI
For the most part he's still taking them on individually, there's a part where he does get several at one time but it is still obviously timed and choreographed.
It's a personal thing with more so than anything, no matter what movie I'm watching it's first thing I notice in any "outnumbered" type fight scene. That's why I prefer the choppy style in those types fo fights. It's easier to hide the choreography and better portrays the chaos of what 4-5 guys attacking the same guy at the same would be like.
Another thing that really separates BB is at the train the first time he confronts Ra's and four guys surround him as Ra's takes off toward Wayne Tower.
Notice how Batman survey the four, picks one and makes the first move by tackling him a taking him over the railing, i.e. he takes the offensive to eliminate the number of opponents as quickly as possible. Now notice how in both those Jet Li clips and almost every other fight scene, the hero takes a defensive position and waits for each opponent to attack him.
What makes more sense? Breaking out of the circle or letting the cirlce close in around you?
And that's my thesis as to why Batman rocks Kung Fu guys' face off.