Yup, that's when it happens, in a hurry and losing concentration!
When I have knick, I put my finger on it and shave around my finger. You might have to skip shaving for a couple days, then use an electric shaver over the cut, carefully.
Or, you can just shave the sides and back up real high, and in a few days have a cool marine h&t recon. Then after about a week, it will be fun to shave it all off!