Visible crew/equipment: After Batman and Catwoman's mistletoe banter, a wire can be seen attached to his back as he glides off the rooftop. (01:20:15)

Batman Returns (1992)
Ending / spoiler
Directed by: Tim Burton
Starring: Christopher Walken, Michelle Pfeiffer, Danny DeVito, Michael Keaton, Michael Gough
Batman stops the kids being lured to death and beats the crap out of the Penguin who dies, while Catwoman electrocutes Max Shrek. Bruce Wayne thinks Selina Kyle is dead. Catwoman survives.
Mark Cuss
Selina Kyle: Honey, I'm home. Oh, I forgot. I'm not married.
Trivia: The shot where the monkey walks down the stairs to give The Penguin the letter from Batman took many shoots to complete, because Danny DeVito's makeup frightened it. According to one interview DeVito gave with Jonathan Ross, on the first take, the monkey even tried to bite him... right on the groin. Thankfully his padded suit prevented any bodily damage.
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Answer: Nothing was stopping them. After Penguin's true nature was revealed, they most likely started searching the entire sewer system but couldn't find where his lair actually was so they had no choice but to give up.