Castle has coding language called "rules". Its very simple. You choose when your script should start for example "When this is created" or "When variable reaches a value" and then you code "Destroy this actor" or "Play a sound". Rules just like other languages are ran from top to bottom one by one. You can start programming by clicking any actor on screen, edit blueprints, going to logic then pressing "+" or "New rule". Go try it out sometime.