Angle or pressure ? I have this BA Wade and Butcher and almost took off my chin with it the first time I used it. I got to a spot I thought was the hairline because I felt some resistance. I shouldn't have kept going as it was where my chin changed angles. Yep watched the whole thing in the mirror, as it happened. It only bled for an hour but I had a spot I had to shave around for a week or so. I have yet to fix up a couple of smilers I have in the repair box. Will pay more attention and stop when I get the feeling I should this time.