The antonyms for the phrase "screaming halts" can be words like smoothly, gradually, easing, and flowing. Instead of abruptly stopping or screeching, these words suggest the idea of something coming to a halt in a more measured and gentle way. The opposite of a screaming halt might be a smooth, gradual deceleration, like a car slowly coasting to a stop. Other possible antonyms could include "slowly", "softly", "gently", "calmly", and "gradually". These words provide a more positive and less jarring connotation to the idea of stopping, suggesting a more controlled and deliberate approach.