While our daughters were playing yesterday, my friend and I saw this happening and wanted to see how it played out...
Riley is determined to steal her friend's pacifier for herself (even though she doesn't even use them!). It goes back and forth with them swiping it out of each other's mouths... At one point Riley growls at her, later followed by her friend getting frustrated, Riley tormenting her by hitting the pacifier on her leg before popping it back in her own mouth, and ultimately leads to her friend putting her foot down... literally! Which finally gets Riley to back off and leave her alone.
My daughter is a little trouble maker!