If he did go inside the camper, maybe little Deorr was already gone by then, so he thought nothing of going inside his camper. He thought he was with his parents. If so, that could increase the amount of time the baby was gone before they realized he was missing.
You know neesaki, I watched the clip of the re-enactment and I'm not even sure that Vilt said that's what GGPA did. I wish someone who also saw it and listened would chime in. Vilt said a few things and the rest was the reporter. I think maybe the demonstration about stepping inside the camper was not a part of the re-enactment but was just a way to prove if someone (GGPA in this case) took their eyes off a child (not by going inside the camper) even for such a short time that the child could be abducted just that fast.