SPOILERS! MASSIVE, CRUEL, CARELESS SPOILERS FROM THE SCRIPT. DO NOT READ.
ALSO, PLEASE STOP DOING THIS.
WE SHOULDN'T EVEN NEED TO MONITOR SPOILERS LIKE THIS AND EDIT PEOPLE'S POSTS.
IT'S OBVIOUS.
BASIC COMMON COURTESY.
SERIOUSLY.
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You've been warned.
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Stop reading!
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Having read the script, I'm pretty confident that this is the scene in which God (represented by the beam of light) infuses the chairs with consciousness and the ability to move, in order to punish The Master for being a false prophet.
The chairs then wait for The Master to sit down on them, but The Master overhears their plan and fools them into thinking that he's about to sit down. Just as he bends down to sit, he turns around and stabs the first chair. The second and third chairs attack, but that's when Freddie comes from out of the shadows and pulls the chairs off of The Master, screaming, "I'M GONNA BREAK YOUR LEGS!" with a violent exuberance that we've never seen from him before. Blood pours from the chairs, organs and bone exposed. The Master turns to Freddie: "Do you see? Do you SEE??"
In the scene after that, The Master bans his followers from sitting. Everyone seems confused. The Master and Freddie share a knowing look. They have now bonded.