When leeches attack

If you approach this minion, he'll task you with taking out three cages. His first is a silver one behind him to the left (as pictured above), which requires an explosive such as Joker's pies. The second is a gold one across the swamp that needs to be melted with a heat beam. The third is just to the other side of the rock that he stands on, and it's wooden so it can be broken with a standard attack. Once all three are broken, he'll pay you the Gold Brick.