Ritual in the woods?

My brother found a child in the woods today who we suspect might have been doing magick, but I can't find any info on the ritual he seemed to be performing. He kept mentioning how he had on a red hoodie and had with him red spray paint and a few tools. He (the boy) was digging a seven ft hole (in which he wished to sleep inside of) at the base of a tree on which had a symbol spray painted (see image below) with four or five wooden planks to the right of it, all bearing the same mark. The tree also had a line around it, as if someone had begun to try to chop it down.

We thought that perhaps he might have been a djinn, as we've come to know that djinn posses people by making them feel a strong emotion (at least this is what we have seen from people who have had close encounters with them). The boy was trying his very hardest to make my brother upset, talking about topics you wouldn't normally talk about outside the comfort of your own home and definitely not with a stranger.

He said the symbols meant specific things to him. The hour glass represented "The time we have left" (his own words), the circle represented his two friends, and the line down the middle showing how they were divided.

If anyone knows anything about what he was trying to do, please let me know. My brother is getting antsy and won't stop bothering me about it and I'd really like to stop hearing "What if he was digging a hole to hell?!" for five minutes. If it helps, the woods were near some train tracks.