For a keyhole scarf, there is a time (when you're making the slit) that you use two strands of yarn. They're saying to use both ends of the skein for that part of the scarf. You'll go back to using one strand after the slit is done.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry