This is very subtle on Pippin's part. He has overheard Grishnakh speaking to Ugluk, so Pippin has a sense that G must know more than he's letting on. Now, Pippin was not at the Council of Elrond when Gandalf explained that Gollum had been captive in Mordor; yet Pippin knew about Gollum. I don't recall any place in the story where Pippin is given this knowledge by Frodo or Gandalf or anybody else. Therefore, it seems to me that Pippin is playing a very dangerous game, and why not? It's life or death anyway. I imagine he figures that if Grishnakh knows as much as he lets on, there's a chance he knows about the Ring and about Gollum. Here's the key for me: by doing the "gollum" in his throat, Pippin lets Grishnakh know that Pippin knows more than Pippin has been letting on, so he's playing the "I'm more valuable than you think," card. Not only that, but Pippin realizes that Grishnkah thinks Pippin might have the Ring. Trouble is, Grishnakh doesn't WANT to need Pippin. Besides, if Pippin has the Ring, Grishnakh want the Precious for himself. I've always found Grishnakh fascinating, the most truly evil orc Tolkien ever evoked. The sheer malevolence in the creature is just powerful!
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