public bool IsBehind(WoWUnit o)
{
var left = o.Location.FlattenZf() + Vector2.UnitY.RotateAround(Vector2.Origo, (float)(o.Facing));
var ray = new Ray2(o.Location.FlattenZf(), left);
return(ray.IsOnLeftSide(Location.FlattenZf()));
}