In what episode of Full House does Uncle Jesse invent the hair shield?
It would only act as a lightning rod if the strike were only a few feet away. In this case, you're already close enough to the bolt for it to be potentially lethal, regardless of whether it hits you or not. Remember that most lightning injuries and deaths are due to ground current and side flash effects, not direct hits.
Some smoke detectors do that when you first put the batteries in or if you hit the 'silence/test' button. It continues for about five minutes then stops. Check the manual that came with it. - YES, my new detector did that when I installed the new batteries. My old one didn't do that. And I too thought at first something was wrong. But since I just installed it and had the manual I read that was normal. And I also have taken new batteries right out of the package and found them to be weak or dead.