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The phrase "the balls went behind the rollers" (literally "the balls slid behind the rollers") is a Russian slang (and slightly humorous) expression meaning that someone has "gone crazy", is behaving strangely, irrationally, or clearly has mental problems. It's similar to English idioms like "everything's not okay," "gone crazy," or "the wheels are turning, but the hamster is dead."
It is often used to describe a person who is "burned out" from overwork, exhaustion, or excessive mental exertion (for example, "retrained").
If you take this literally, then the balls and rollers work fine separately, but if they "slip off", the mechanism will fail.