I'm serious. If I thought I was looking for a living person I'd be calling her name, not shining a torch onto undergrowth.
But it wasn't Luke who was doing that, it was Kelly. Luke was looking over gaps in the wall and in the crop field because he hadn't seen anything on the path on the way up (That's from the family search trio's statmentts.)
By your argument, Jodi's family members must also have thought they were looking for a dead person, because they set out with torches as well, and they headed to the one place Jodi was (apparently)
definitely not going to be that evening. They didn't look for her on the way there - didn't even turn on their torches until they got to the entrance to the path.
And neither Janine or Steven called out Jodi's name either - do you suggest they too were acting suspiciously? Can't have it both ways.
Something I did find strange, though - Janine said, regarding Luke climbing up to shine his torch over the wall, and going into the crop field, "It was as if he was looking for something." What could she possibly have meant by that? They were
all looking for something - or rather, someone - Jodi.