I am looking forward to your paper. While I agree with you that speech is generally protected, my concerns would be with negligence and/or strict liability. Is Mr. Pantazi putting an inherently dangerous comodity (martial arts information) into the stream of commerce? Does he have a duty to anyone who might be injured by his placing this information into the stream of commerce?
Would the use of the information by a third party be a sufficient intervening act so as to insulate him due to lack of proximate cause? Does he have a duty to warn?
I also believe a more intriguing question is whether Mr. Pantazi would be liable to an individual who used a technique he describes and finds it ineffective, or is injured due to the application of the technique. In addition to issues of negligence, I believe a person using Mr. Pantazi's information who suffers injury in reliance upon the use of the information, could have a cause of action based on contract. Most of us pay a fee for accessing the information super highway. While Mr. Pantazi might not get any compensation for his input into this forum, if he is earning money as a martial arts instructor, one could argue his participation in the forums is an extension of his commercial enterprise, and his offering of techniques must be made subject to the implied warranties of merchantability and good faith and fair dealing.
Obviously, I think the question is extraordinarily complex. And, while I also agree with you that the possibility of liability is somewhat remote, it would not surprise me to see litigation.
I look forward to your research. Peace.
Robb in Sacramento