Flowmotion -- Acero can fluidly move around on both land and air. This allows him to perform feats such as kicking off almost any surface, air dash, swinging around lampposts, grinding along rails, and battling enemies with speed and style. Basically using his environment to his advantage. Acero doesn’t move super fast, but he can keep up with speedier opponents (not Tyrian or Qrow kind of speed mind you) and outspeed and outmaneuver slower opponents.
Acero can only use his semblance when the terrain calls for it, meaning if he’s in an open field or desert, he loses a little maneuverability due to the loss of wall running/jumping, and can get overpowered by fast opponents due to his semblance excelling in tight places. It also takes a lot of accuracy and energy to pull off very complex maneuvers in a battle, which means if he messes up just a little, it could cost him. Due to having years of practice, he doesn’t have to worry about his accuracy or energy too much, but the threat of messing up or running out of steam is still constant while he fights. If Acero goes 100%, he can fight for about 3 minutes. If he goes 75%, he can fight for about 5 minutes and so on.