Eurylochus didn't want to enter the Hall because he sensed Circe's foul play. He was being cautious and didn't want to fall into her trap. Later on, you find out that he was right. Odysseus' men are turned into hogs and Eurylochus rushes to tell him.
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Circe turns the men into pigs with her spells.
He is Second in Command of Odysseus Legion. He is also the one who led some men into Circes Palace when they were turned to swine. He was the only one in that group that was not turned to swine because he feared a trap.
Eurylochus is Odysseus' second in command.
Hermes giving him the moly potion
A year.