The title is exactly what jumped to mind when I came across this scene. Such unexpected scenes are sure "preys" to the GRD IV as it is so suited to one-handed control that one never needs to stop for the snaps or worry about missing a shot -- well, at least after being familiar with its operations. And its AF is discernibly faster than the III.
In the customisable ADJ slots are what I think the most important functions for doing street shots, namely, ISO values, Image Mode, WB and Metering Mode. I very often toggle between them for tweaking when doing street shots on the go. An extra tip to "beautify" your shots is to use Cloudy for WB to give images a warm glow which will make people think that you're an early riser to do shots.