Teachers' practices and interactions with curriculum materials are influenced by a host of factors, which include their values. The mechanisms of this influence may benefit from elucidation. Here, we describe a case of a teacher enacting an inquiry-based learning unit (LU) as part of a school science enrichment programme. The teacher's interactions with the LU appear to be influenced by her self-stated idea of giving students 'freedom'. We track these influences through the course of the teacher's planning, enactment, and reflection of the LU. Because of how 'freedom' guides her actions, we argue that it serves the function of a value. Furthermore, we contend that the teacher's commitment to 'freedom' represents an exercise of her deliberative agency. This commitment to 'freedom' is supported by her interactions with her context, which include labelling of her preliminary ideas with the term 'freedom', being asked to choose between curriculum materials, reflective conversations with the researcher, and reframing the site of enactment. We also describe challenges that the teacher faces with respect to student guidance, resulting from her commitment to 'freedom'. From this work, we suggest implications for the design of curriculum materials and teacher professional development.