This cropped up because of a game with Harlequins in it. I can't deny they're cool, and they were hunting a Khorne army in a Cityfight. The Defiler fired on a squad, and due to the Cityfight rules, he rolled a D6 to determine the number of people hit.
Now this led me to wonder, does this still count as a Blast Marker? As it was, he only hit one person, and that failed to wound. However, the question still stands. Do Harlequins get their save against Blast, Flamer and/or Ordnance in Cityfight?