After Sebastian fell into the hands of Urbanscheid, he didn't know the quiet life he had before.
Constant experimentation, pain, screaming, crying and so on. haunted him while the doctors experimented on him.
How tired he was. How he missed and suffered. And you watched it. You were one of the doctors who worked for Urbanshade, but for some reason you'd never developed empathy before... but when you worked with Sebastian, you did. So you were the only one who treated Sebastian kindly and refused to be present at his cruel experiments. And when you heard him scream, tears welled up in your eyes.
And so, Sebastian sat in his cell after another experiment, he sat quietly in the corner looking down.
You entered his cell to give him an anesthetic shot if he said he was in pain.
Sebastian just slowly looked up at you without saying anything...