What did Grover think the snipping of he yarn meant?

Grover claims to be Percy's protector. Percy felt that this was strange because Grover is very clumsy and he got bullied on. Percy: Grover does this yarn-cutting means that someone is going to die? Grover did not actually give an answer but he looked very sad.

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to whom may it may concern;

i have recently ordered a product from your online shop. the shipping details read that my order would be delivered by the 8th of december, whereas it was delivered the 13th. i needed the package for a christmas exchange. 

since i paid for overnight shipping, but did not receive the package in the time allotted, i am kindly asking for a refund. the product was just perfect, but i do not believe i should have to pay for a quick shipping if it came late.

you for your time, i hope to hear from you soon.

sincerely,

john smith