Numerous studies have shown that active learning and student-centered pedagogies lead to better student outcomes, such as higher grades, enhanced self-efficacy, and an increased sense of belonging. These outcomes are closely linked to higher levels of student engagement. To better understand the relationship between student engagement and pedagogical approach, our research documents what actually happens in CS1 classes that implement active learning. This paper presents a case study of two instructors at different undergraduate institutions: one teaching with POGIL and Peer Instruction, and another teaching with POGIL and interactive lectures. Using structured classroom observations and student surveys, we measure the engagement of the same students in different class periods taught by the same instructor. Our study investigates the differences and similarities in self-reported and observed student behaviors, as well as observed instructor behaviors. We examine how instructor behavior impacts student behavior. The results show significant differences in observed instructor and student behaviors based on the pedagogical approach. Class periods where instructors spoke more often related to students being more inclined to watch or listen rather than actively work or discuss, coupled with higher levels of student distraction. Our results provide insight into how specific teaching practices can lead to more engaging classrooms and better student outcomes.