After a pause Vinnie was unable to resist her temptation to speak and started
"Don't you think that you should do something about this?"

"Yes, that's what I am thinking .What to do next?! You know, sometimes I think that Mark is a psychopath, whenever we conducted any experiment on mammals (mouse) ,Mark always enjoyed doing experiments in which a disease would kill the mice. I've seen in his eyes a sensation of pleasure when he sees someone getting hurt.
He never tried to cure someone's wound, but has always been busy trying to find out more ways to make it worse. Like I remember once he tried to put his cat in a glass tank and leaking poisonous methane gas to enjoy the sight of Thore."

"How could such a person be your assistant? " Vinnie Argued.

"Despite the fact that he was a lunatic and a sadist , he was a genius, he was the topper of his batch and had a keen interest in genetics. And his passion towards the work is the only factor that made me accept him as my assistant."