Thanks Sam!

logging_changes_on_changes.js

(function() {
  return {


    events: {
      'app.activated': 'init',
      'ticket.requester.id.changed': 'onRequesterChanged'
    },

    init: function() {
      this.switchTo('main');
      console.log(this);
    },

    onRequesterChanged: function() {
      var self = this;
      setTimeout(function(){  // Without setTimeout there is a race condition unless lotus has data cached
        console.log(self.getUser().email());
      }, 1000);
    },

    getUser: function() {
      switch(this.currentLocation()){
          case "user_sidebar":
            var userData = this.user();
            return userData;
          default:
            var requesterData = this.ticket().requester();
            return requesterData;
      }
    }

  };
}());