Enemies shouldn't fall to begin with if you shove them away. In 5e, "Shove Prone" and "Shove Away" are two separate actions, but Larian hasn't implemented the former for some reason.
- You want to move an enemy away so you can move without provoking attacks or make attacks at not-Disadvantage? You don't also get the free benefit of making them prone.
- You want to shove an enemy prone, giving Advantage on adjacent attacks against them and Disadvantage on theirs? You don't also get the free benefit of shoving them away.
An exception could be if the enemy takes fall damage -> they make a Dex (or Str) ST to remain standing, with the DC dependent on the damage taken.
