Too many things depend on your specific circumstances for generalized advice to be helpful.
I cannot even begin to describe how many times I've heard commenters here spout advice like they are experts in patent law when they simply don't have the most basic grasp about them. It's terribly frustrating and scary to see people taking this often horribly wrong advice.
Sure, some people here are right, you probably don't have much to fear, they're probably just bullying you, but please, please, please don't take legal advice from a random forum. That's like taking advice on rails development from a forum full of lawyers. They just won't know what they're talking about much of the time and it can be very dangerous.
He has a plethora of options at his disposal, being the real deal in this situation. If this was a letter from a lawyer, then it would take a lawyer. Does it need to be more complicated?
Advertising that you have no legal representation is a very bad idea. They can find ways to get you to say things they can use against you, for example, by making things sound bad and thus convincing you to deny things you shouldn't.
And yes, I have had this explained to me by actual lawyers.
Legal consultations aren't that expensive, either.