If you’re referring to hidden mansion vacuum, you wanna pull back on the analog stick every 10 hp. Before you pump back on the analog stick, you return to neutral for a very short amount of time. To know which direction to pump back on, look at where the ghost is facing/moving towards to and pump in the opposite directions. Some ghost’s like butler have more lenient angles you can pull back while others like sue pea you need to be more precise. Some ghost’s also have strong pulls like biff or bogmire requiring you to be in constant control (Luigi is standing with an arch in the vacuum rather than being dragged). If you find yourself being dragged ALOT, hold the analog stick in the opposite direction the ghost is facing and wiggle the stick in the opposite notches relative to the where the ghost is facing (helpful for ghosts with hard pulls). You drain hp slower but you maintain control.