Corrected entry: It makes no sense for Clay-Face to fake like he lost control of his abilities in order to fake his death when he's close to killing Batman.
Heart of Ice - S1-E3
Corrected entry: Mr. Freeze's cell at Arkham Asylum has been modified to accommodate his inability to survive outside of sub-zero temperatures, but his cell has a barred window which could easily allow warmer weather to interfere with the temperature regulation (the episode's opening scene states that Gotham is in the midst of the hottest August on record). (00:21:00)
Correction: A single small window even in an area of high heat would not be able to interfere that much in a sub-freezing room with a dedicated hyper-cooling system.
Correction: Clayface wasn't faking losing control of his abilities. He really was losing control. When Clayface saw all the characters he played over the years as Matt Hagen, he began turning into each of them involuntarily but, because there was too many of them, he became overwhelmed and couldn't stop transforming. He even begs Batman to shut off the screens. Https://www.youtube.com/watch?v=K4W8Wp6SzdM.