From Nik's blog
QuoteAt the same time Ray charged the non-Fanatic Military Order unit at Mongol Cavalry who Ran Away to avoid the chance of being caught. Being Skilled shooters they still shot on White dice as opposed to the White+ if they had Skirmished, so could still be effective - alas they weren't.
I had thought that a downgrade for skilled from white + S a wound would be black + S a wound as you drop a COLOUR .
So what should it be ?
You are correct it is a colour downgrade and thus was Black +
I was probably thinking about the the number of Wounds that the shooting can cause as Black + and White are the same, the advantage White gets is an extra chance of a Slow effect due to the "S" in addition to the 2 Wounds.