'work even in pattern' just means follow whatever pattern is established, without increasing or decreasing.
Yes, the k2tog is your decrease- it takes 2 stitches and turns them into 1.
Mommy to two wonderful girls
"I don't have to conform to the vagaries of time and space, I'm a loony!" -Campbell Bain (David Tennant) 'Takin' Over the Asylum'
OTN: Cabled Sweater
, arm warmers, kids' clothes