Is there any circumstances under which a feather could kill you? Apparently so, at least according to this video.
Actually, I think this video has missed a trick. While it’s a revelation to discover a feather dropped from space would literally cut you in half, there are plenty of other ways a feather could kill you.
Someone could poke you in the eye with the pointy end and wait for you to bleed out. Or they could ram it down your throat until you stop breathing. Or they could dip the tip in poison and brush it against your skin.
In other words, the answer to this question is, Yes, Yes, and thrice Yes!