I would imagine there might be some foot tracks showing the path they took? Then again search party may have trampled any kind of trail that was left behind. Considering the geographical knowledge the killer had, he has to be a local or someone that grew up in the town.
Regarding the still shots, the jolting to the left you pointed out in a previous post was probably the killer changing direction and heading toward them. Probably walking with his head down then heading straight for the girls with pistol or knife out. The still shots we've seen were probably right before he approached the girls. I'm still surprised they haven't caught him yet. No results after all the tips and reward money, it's starting to look like a cold case.