Answer:
Stage direction.
Step-by-step explanation:
Stage directions are the instructions that a story or a play has in between the dialogues ad even the beginning of the play. They indicate how the actions are done, where or what is happening and the movement, the position, or even the tone of whatever is happening in the scene.
The given detail from Blanca Flor is an example of stage direction. It indicates the unspoken action that is happening in the scene, which cannot be mentioned as part of a dialogue. It also reveals the actions of both the Duende and Juanito which cannot be spoken of in words but only seen in actions.