Another stealth update: when 4* Scorpion was released, Red was his strongest color and Green his 2nd strongest. The damage numbers have now been flipped and Green is now his strongest color, Red 2nd. Matters if you run him with/against characters with powers affecting strongest colors (e.g. 5* Carpool, 4* Valkyrie, 4* Captain Marvel).
So probably not an intentional nerf per se, I have to imagine it was never intended behavior, but along with this update G4mora's Deadliest Woman no longer treats charged purple tiles as friendly specials for the purposes of insta-kill. Just thought I'd let y'all know if you lean on it for Challenge nodes and don't want a surprise.