Lucia demonstrates two key skills in this encounter:

1. Responsiveness to the audience: She notices the puzzled look on the homeowner's face, realizes he might not understand the construction term "cellulose insulation," and promptly explains it to ensure he comprehends her message. This shows an ability to adapt and respond to the audience's feedback.
2. Tailoring the message to the audience: By explaining the term in a way the homeowner can understand, Lucia customizes her communication to suit the listener's level of knowledge, making her explanation clearer and more accessible.

These two skills reflect both public speaking and conversational abilities—adapting communication based on audience feedback and adjusting the message to fit the audience's needs—leading to effective and engaging interactions.