(A Game of Thrones, pg. 136). Tyrion has just realized that it was Joffrey who sent the cutthroat, and is subtly telling Joff that he knows. However, Tyrion later worries over what Joffrey might do because of what he discovered: He squirmed uncomfortably. He ought to have held his tongue at breakfast. The boy knows now.
Game of Thrones will remember that Joffrey was poisoned by Lady Olenna Tyrell (Diana Rigg), aptly referred to as ‘the Queen of Thorns,’ at his own wedding. Most read in TV and Showbiz FAREWELL
Secondly putting the poison in the necklace and making sure everyone sees Sansa wearing it puts the blame squarely on Sansa, which is why LF left the necklace behind after he killed Dontos, so that it would be found. The intent with this is 1000% to frame Sansa for the poisoning, her simply escaping after Joffrey dies wouldn't be enough.
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