Serial dependence in visual perception and working memory refers to systematic biases in current estimates toward or away from previously encountered stimuli. Recently, Chen and Bae (2024) used continuous mouse-tracking in a pointing-direction delayed estimation paradigm to show that response trajectories initially exhibit a repulsive bias away from the previous trial’s stimulus before shifting toward an attractive bias when a secondary distracting task is introduced during the delay. Here, we conducted a high-powered replication of Chen and Bae (2024) to examine the dynamics of repulsive and attractive serial biases across response execution. We successfully replicated their core finding that an intervening distracting task shifts final reports from repulsion toward attraction, while response trajectories initially move away from the prior stimulus. Furthermore, we found that individual differences in serial bias are already evident at the earliest stages of movement execution and remain stable across conditions, challenging standard Bayesian observer accounts of serial dependence.