I think the way the shadows fell, it may have been a hard place to make things out clearly. Let's say she noticed somebody there, she may have been trying to make out what they were doing, she may have thought it odd, as we do now, thus looked again and again. Whatever she was able to see at the closest point to that spot, as she seems to look right there passing by, did not cause her to stop running. There are objects that are not plants or trees or stumps or boulders around the figure that are unnatural, man made and reflect light differently, it seems to my eye.
hmm... going off your idea, Bklyngrl007. Just thinking out loud (speculating awful stuff, sorry) Two people, could be or more with, maybe a bike, maybe a computer, hand held devices, kind of like a perfectly planned gang rape gone wrong, if not shapes in clouds? LE seems pretty sure it's one left handed person who may have grabbed her, according to Chief Det. Boyce. Interesting, because could that explain the lack of tips? The only people who know what happened are covering up for each other? Then, the very nature of a coordinated crime like that would have been to provide maximum cover for the one, two or/and another individual. So, following that logic or leap, it would have been two or three young men never in the system with deep bonds of loyalty trying to pull this off. Then having it all fall apart. So two or three young men, one really beat up, told a story that isn't true to everybody else they know about what happened to the beat up guy, possibly? Maybe family took care of any wounds or he crept under a rug, but it must have hurt, considering Karina's strength and the struggle she seems to have put up, with weeds still clutched in her hands.