I get that dimness sometimes too but not as dark, there are also times where it is lighter as well. It usually happens if I am changing between screens a lot, especially mission ones.
As for that pvp pic, I saw the excate same thing on my end. After your special I was stuck with you but luckily I could still rotate my weapons so tried a special and to my suprise it worked O.o No black screen and just he just did the special (which kinda looks cool)
*Hides my typo in that picture*