Yeah, I read this as more of a "Tongue in Cheek" comment.. "Hey little kid, you're bothering me... can I just pay you to go way... you're getting annoying.".. Not any admission of guilt.. Hell, i would have probably done the same... had I not already lost it all in AM shares 
Assuming it's real (and I've got no reason to believe Airwolf is capable of faking an email) I find it highly unprofessional. Havelock isn't exactly swimming in cash and I'm sure their shareholders would rather be paid that 10btc than have it given to some wannabe gangster who made a few empty threats.
Like Fordee said: they were probably not serious. AirWolf is making a big show out of it because, well, it's AirWolf. He's known for his shenanigans. The funny little kid. See, that was not serious as well. AirWolf is not funny, he's sad.