Mongoose remove not working?

I'm at a loss here I know the remove method is being called but it's not removing the document in the database.

mongoose.connect('mongodb://127.0.0.1/pwrcourse', (error) => {
  Course.find({}, (error, courses) => {
    for (let course of courses) {
      let courseDir = path.join(BASE_DIR, course.title.replace(/\s+/g, '-').toLowerCase());

      for (let x = 0; x < course.lectures.length; x++) {
        let pad = (x > 8) ? (x + 1) : '0' + (x + 1);
        let fileName = pad + '-' + course.lectures[x].title.replace(/\s+/g, '-').toLowerCase();
        let filePath = path.join(courseDir, fileName);

        if (!fs.existsSync(filePath + '.m4a')) {
          console.log('Course ' + course.title + ' has been removed!');
          course.remove((error) => {
            if (error) {
              console.log(error);
            }
          });
          break;
        }
      }
    }

    process.exit(0);
  });
});

via Philip Rollins