None. Compare the physical danger you face with that of the other kind of head-hunter, and you should be able to breathe easy. People don't like it when you shrink their friends' heads, and they might come after you with a vengeance. Not so much in your line of work. You might tick off a company from whom you've wooed one of their top talents, but they aren't likely to blow any poisoned darts into the back of your neck.