B..
Get around where? From the crime scene? (Physically able to run quickly?) Or get around the park? Get around the town (IE spotted on traffic/store cams shortly after)? "Getting around quickly" and "hiding in plain sight" are kind of diametrically opposed scenarios, right? Either he walked out in plain sight, or he escaped without being seen.
I think the officer is referring to a totality of circumstances:
- The murderer apparently knew of short cut trail in and out of the park that cut across private property and might of been comfortable moving overland through private property by skirting along the edges of farm fields etc., or using by little known rural alleys in the area. Thus, he moves around quickly with needing the more visible roads
- The perpetrator is probably local, but does not have any mannerisms, mode of dress, or a physical look, that would set him apart from everybody else. Thus, he "hides in plain sight".
The perpetrators abilities remind me of my youth (non criminal of course). My friends and I could "move around quickly" meaning we knew which creeks had trails along side them, which short cut trails allowed travel between groves of woods, knew about lesser known connecting alleys, and knew which trails led to holes in what fences. Likewise, we "hid in plain sight" meaning that our dress, mannerisms, bikes, matched that of local kids.
Neither me nor my friends had extraordinary physical abilities, nor did we move around say, ninja like to avoid being seen. Rather, we just had knowledge of local stuff that while not secret, was not well known and when we were seen, we fit in. Thus, we could "pop in / out of" places fast and/ or un- noticed. It is the same with the perpetrator.