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Treguard says: "Think, team!"
Treguard means: "Listen to the clue I'm about to give you, team."

Greystagg to Barry:

"I only have the power to disperse one of the fields... Which shall it be??"

What she really means:

"Can you get a move on! I'm dying for a dump and I'm waiting for an Argos delivery... And it's due any minute!"

Treguard says: "This is no game of numerous lives. Here you have only one."
Treguard means: "...Or sometimes two."

Merlin says: "You will have to take the path without my help.... remember, others have done so and still survived."

Merlin means: "You've blown it. You're now in losing status. However it would look really bad if i personally terminated a dungeoneer, so i'm gonna lie to you and give you false hope. The goblins can finish you off in a few minutes time."