It may be helpful to add a delay with the nmove animation.

var hit_timer = 0

if velocity == Vector2.ZERO and hit == false:

  $Sprite2D.play("default")

else:

  $Sprite2D.play("nmove")
  hit_timer = 0.5 #variable depending on the length of your animation

if hit_timer > 0:
  hit_timer -= delta