User blog comment:Xilinoc/Ch. 580 - THE LIGHT/@comment-24113610-20140515082450/@comment-24113610-20140516050207

That would imply that Giselle's opponent knows that they can't get her blood on them. She didn't reveal what her ability was until after they cut her so she's clearly smart enough not to tell someone who's an actual challenge. Most Shinigami attack with their sealed swords first and she's not likely to dodge since she can't die anyway And shunko doesn't mean anything; people can still bleed when they get punched in the face.