He should scare you. He has one talk where he asks for volunteers from the audience to try to punch him. The ways that he proceeds to immobilize them relate to the various points he's making in his talk.
He's also the only person that I can think of who would seek to explain the concept of elementary particles being made of quarks using Mars bars as analogies. Right down to the fact that the sum of 3 of the masses of the small Mars bars slightly exceeds the mass of the large one - that right there is the binding energy!
For those who have not experienced him, Damian is hard to explain. For those who have experienced him, the full mind-bending reality is hard to remember. He's the only person about whom I say that if he's giving a presentation you go, just because it is Damian. Even if you don't know the topic. Even if you hate the topic. Even if you're bored by the topic. It is Damian. Go.