What does "As he starts reading his travel guide, he hears:" mean in English for Spanish?

In English for Spanish, "As he starts reading his travel guide, he hears:" means:

En cuanto empieza a leer su guía de viajes, oye él:

Listen to "As he starts reading his travel guide, he hears:": (If you have an HTML5 enabled browser, you can listen to the native audio below)

This is a phrase that is used in the GamesForLanguage English for Spanish Language Game in the following scenes:

• English for Spanish 3, Level 3, Scene 10