Upper: Temperature plot in vertical slice V1 at time t = 350 s, where the slice intersects the swirl S1. We note the difference in time to Figure 1. The scale is set to highlight the chromospheric plasma showing characteristics of type II spicules. Middle: ratio of sound and Alfvén speeds in slice V1, with the equipartition level (c_s/v_a = 1) outlined by the dashed line. Lower: Structure of the vertical magnetic field, with streamlines overlaid for z > 0 Mm. The vertical dotted line splits the slice into two sections (with the swirl (S), and without the swirl (NS)), which are used for analysis throughout Section 4.