-Does his best to avoid eye contact-
It was the same with my clones. Cellular degeneration from the DNA that gets progressively more scrambled. That's what killed them. And... it's what's killing you.
What if there’s no better word than just not saying anything?I spent months trying to find a way. I was sure that if I could just find the right enzyme, the right base combination... But it's a fundamental part of the cloning process they used. It was deliberately made that way from the moment of conception.
...
I'm sorry. I'm so sorry.
What if there’s no better word than just not saying anything?I don't know.
...
Longer than mine did. They had days at best. Time Lord DNA. Human DNA is a lot simpler. More adaptive.
What if there’s no better word than just not saying anything?... I didn't want it hanging over you. But I should have told you. Guess I was just scared.
What if there’s no better word than just not saying anything?

You know that... you're a clone, right? An attempt to replicate another organism genetically. That in itself is fine. Absolutely fine. But... the process they used was imperfect.
What if there’s no better word than just not saying anything?