The scene in question, (sic) was a very emotional and tough scene between Christian Bale and Bryce Howard. A scene that required soul bearing and a deep level of immersive concentration. The sort of scene where everyone on set knows not to get in anyone’s eye lines, and definitely not to move lights around while filming. You lock that shit down before the scene starts.
It would be tough to take this sort of self-important posturing seriously in any context, so it’s worth remembering that Bale was filming the third freakin’ Terminator sequel when he exploded. Does pretending to fight an army of genocidal robots really require “soul bearing and a deep level of immersive concentration?” Really?