[Nathan stabbed himself on a hypodermic needle that had been disposed of in a bin-bag. Now he has instigated a witch-hunt and has bullied Sam into resigning because his bipolar disorder may have made him forget to dispose of the needle properly. As Sam's boss, Charlie confronts Nathan
I just wanted to tell you face-to-face that I think undermining and intimidating the most junior, the most vulnerable member of the team here is utterly despicable. I don't want to hear of it happening again.