Velocity offset scaled by – as an estimate for 3D velocity – centered at the center of the protocluster (Hill et al. 2020) versus projected distance from the 850 μm-weighted center of the protocluster. Orange circles show detections of [C II] and CO(4–3) with ALMA (Miller et al. 2018; Hill et al. 2020), green square and triangles show Lyman-α emitters detected and candidates, respectively, in the extended emission showed by LABOCA observations (Fig. 1), blue squares and triangles show the Lyman-α emitters detected and candidates, respectively, in the southern pointing, and the red star shows the Lyman-α blob inside the 90 kpc defined as the effective radius. Black lines show the escape velocity from the protocluster. The measured velocity offset uncertainties are negligible, and therefore error bars are smaller than the size of the symbols.