Batman Return to Arkham: Arkham Asylum - Chapter 9 - The Old Sewers (Killer Croc)

I head inside Croc's lair, found the plants, set up Croc with explosive gel and returned to Batcave to formulate the antidote. As I did that, Ivy's plants goes out of hand and gets stronger. Before I left, I needed a gadget where I pull down weak walls. Joker has three pumps in the caves that I shut down, and then he trapped me and sent another TITAN monster to challenge me along with his men, and then I made my way out of the caves, hunting down Ivy.