When fighting Ashwinder Rangers, it's important to defeat them quickly before they can disrupt the flow of combat and make it harder to finish off the rest of an Ashwinder group.
Ashwinder Rangers may be dangerous when at a distance and on the offensive, but they're severely lacking when it comes to protecting themselves with defensive magic.
Their vulnerability makes them good targets to focus on early, and players should pull them in close with Accio and then hit them with other spells like Levioso or Flipendo.