You ate it to safe them and yourself. Being on similar terms like Killer, you had to eat the smile smile fruit, also known as 'the Smile' in short. You came out of that prison like place, soon reuniting with Penguin, Shachi, Bepo and your Captain - Law. They were also bruised, but you.. Oh you.. A wide smile stuck on your face as you laughed but also cried. The devil fruit you ate, making you unable to even express sadness completely.. They were shocked and didn't know what to do while you were having a mental breakdown in front of them..