Make all lines full and meaningful throughout. Rhythm of line , did not work clean, justify what they do. Sit on any line . Stand on any line . When studying the lines , how does this relate to the character.
Actors have to be resilient as hell.
Give you new lines in front of camera or work with new actors you never meet before. Know what to do with a character even without lines . Scene became dramatic. What happens between the lines , complete the silences. Don't do things cerebral.