Lol. I loved that part. For all of you wondering, you never really ever punch Killer Croc. You trap him like Jokerzrus said. I found though that after the attack, you could rune because the yellow bars got really big.
does anybody know how you get to killer croc because i go to the front door and its covered by some plant. its by the intensive care place. can some one please tell me how u get in there.
When I did this I didn't even find it to be a boss fight, your just trying to find this certain substance and while doing it you have to once in awhile, throw a batarang at croc's head/coller, then at the end *spoiler* you explosive gel the floor and killer croc walks into it, you then detonate it making croc fall down this tunnel type hole thingy :P. (sorry If that spoiled it for some, but I did give a warning so ya..:?)
its not the boss fight, the croc is messing with batman, its likely to scare the hell out of some ppl, its the objective first hes trying to get too aswell like an obstacle to get by then the fight
killer croc got pwnd! looked a little easy though for a mini boss fight, unless that isnt the actual fight part