Continuity mistake: In another major battle scene William Wallace is running into battle with a bloody claymore in his hand. In the next shot of him it is back in its sheath. Then in another scene he has it in his grasp again, but this time it is clean.

Braveheart (1995)
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Directed by: Mel Gibson
Starring: Mel Gibson, Brendan Gleeson, Brian Cox, Patrick McGoohan, Catherine McCormack, Sophie Marceau
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Princess Isabelle: I understand you have recently been given the rank of knight.
William Wallace: I have been given nothing. God makes men what they are.
Trivia: Perhaps you're wondering what William Wallace shouts after delivering his speech just prior to the Battle of Stirling. It's "Alba gu brath," which means "Scotland forever."
Question: Why does Wallace spit out the pain killer that the princess gives him?
Answer: Because it's a reference to what his Father's last words to him were at the beginning of the film before he was killed, 'I know you can fight but it's our wits that makes us men'. That's why Wallace says to the Princess, 'It will dull my wits and I must have them always'.





Chosen answer: Just like he said, it would dull his wits and not leave him fully lucid the next day when he had to face the torture.
LorgSkyegon
He wanted his full awareness so he didn't accidentally yell for mercy.