get his phone number and get this bloke to ring him to tell him about his particular set of skills in a Liam Neeson “Taken” stylee.
https://www.fiverr.com/stevevz/make-liam-neeson-speak-your-video-message-in-the-phone-scene-from-taken
“I don’t know who you are. I don’t know what you want. If you are looking for ransom I can tell you I don’t have money, but what I do have are a very particular set of skills. Skills I have acquired over a very long career. Skills that make me a nightmare for people like you. If you let my messenger bag go now that’ll be the end of it. I will not look for you, I will not pursue you, but if you don’t, I will look for you, I will find you and I will put a rape alarm inside a week old wet fish and post it through your letterbox.”