The Witch has very similar aggression mechanics and pathing like Common Infected - if she cannot reach a Survivor outside of the saferoom (usually due to glitches in the map), the Witch will flee. Likewise, when retreating, if a Survivor blocks her path too long, she will attack them instead. She will change aggression if she is biled or ignited by incendiary sources from another target that was not the primary aggressor.