Bsically to reference the turrets specific to the portal series, and the portals specific to the portal series.

not (portal) but (portal_series), and sure. Though it does seem to be a bit overly catagorizing.

no more so then mario implicating mario, or twilight sparkle implicating friendship is magic.

implicated turret_(portal) -> portal_(series)

That said, I had to retag some images as turret_(portal_ was not actually a used tag just yet. that said, there are still a few more images under under *turret* that may or may not need to be tagged as such.