What is the definition of Pale Shouldered?

"A pale shouldered knight, clad in nothing but his pale, battered armor and a mischievous grin, stands before the castle gates, ready to deliver a whimsical yet ominous warning: 'You shouldered pale enough to scare a dragon!'"

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Here's an edgy example sentence using the word: "The pale shouldered mercenary, clad in nothing but his faded uniform and a heart of gold, delivered the ultimatum: 'You shouldered pale enough to make a ghost blush, but not so much that you'd scare the local squirrels into hoarding your lunch!'"