Just before the clash between the charging English cavalry and the Scots (first battle): the Scots plan to have spears in their hands to stop the English cavalry.

Cavalry charging, cuts switching between the cavalry and Wallace/Scots giving commands to hold. Just before they pick up the spears there is a cut where the Scots already holding spears and screaming. After this there's a cut back to the cavalry and another cut showing the Scots picking put the spears. Cut again to the cavalry and back to the continuation of the cut before showing the Scots holding the spears and screaming(front shot from the perspective of the cavalry). Just before the cavalry ends up in the spears.

This is around the 123rd minute of the movie.