Space–time evolution of a top view of Si IV (in IRIS Data Numbers per second assuming the signal would cover an IRIS pixel of 0.″166 × 0.″166) from a 2.5D radiative MHD simulation reveals two jet-like features (inside the dashed white ovals) that propagate at high apparent speeds at t = 630 s (﹩x=14\mbox{--}15.5﹩ Mm) and at t = 680 s (﹩x=11.5\mbox{--}13.5﹩ Mm), with similar speeds as seen in the observations (Figure 1). These jets form on already existing spicules (whose space–time path is outlined with dashed white parabolas). The vertical solid lines are the instances shown in Figures 3 and 4. This plot is based on a top view of the simulation shown in Figure 3, i.e., the x-coordinates are the same in both figures.