Logic help using Accelstepper

I have been using Accelstepper for some time now to move multiple steppers and I'm going through my code again to clean up the movement and had a question about a short piece of code for homing a stepper on startup.
I was using moveTo() and thought I would just use setSpeed() and runSpeed() to achieve the same thing as moveTo() without using steps. I tell it to run if the hall sensor I have is HIGH but when the hall sensor goes LOW I would have thought the stepper would stop moving since the hall sensor is no longer HIGH but it hits the sensor and then starts running in the opposite direction. I added in an if statement to stop the motor when it is LOW but I can't figure out why the motor moved the way it did.

while (digitalRead(carriagetop) == HIGH) {

  if (digitalRead(carriagetop) == LOW) {

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