[quote=@harinezumikouken]
After hearing out the girls with what they had to tell him, Shiro nodded once and took off towards where they directed him.
[/quote]

Hey dude, far as I remember the two faunus girls Shiro is talking to came from different and separate parts of the Shelter, I don't think they would have any way of knowing where Pop happens to be at this point in time. The Coyote girl would of course but she left the island.