Here are several slime mold films I found on youtube which are helpful to understand how the slime mold "moves" as it grows.
This first video shows a slime mold pulsating as it grows, spreading out in a yellow gunge which takes over the ground it lays on.
This second video shows how the slime mold "dominates" its enviroment. Its somewhat grotesque to watch, however shows the slime molds somewhat "alien" appearance and power to submerge its victims.
This last video shows how a slime molds fruiting body is formed, extending out and "gracefully" turning into a stem to form new life from a blob of microscopic gunge.