Characters
The sensation you feel is the Quickening. We are one, MacLeod. We are brothers!
— Ramirez ‧ Highlander

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker tells MacLeod that the sensation being felt has a name, the Quickening, and treats it as evidence of kinship. Declaring "We are one" and "brothers," the words are urgent and embracing, turning a private feeling into a shared identity between two people.
Context reviewed