1 the game engine is working as designed
2 casting it on a weapon doesn't dispel darkness, only casting it on the ground does
3 yes being blinded is a bugger... hint: other area effect spell can still be cast on your self if blinded... like say glyph of warding, rain & ice storm


Luke Skywalker: I don't, I don't believe it.
Yoda: That is why you failed.