As you wind stroke the fibres back with the index finger and thumb of your non tying hand. Its a technique from tying salmon flies called doubling. With game bird hackles it takes a deft touch to pull it off. If you do this, you can shape the hackle according to how you want it to be when finished. A little hair conditioner may help with the splitting of the stems.
"Political correctness is a doctrine, fostered by a delusional, illogical
minority, and rabidly promoted by an unscrupulous mainstream media, which
holds forth the proposition that it is entirely possible to pick up a ****
by the clean end"