Trust issues
When he returned to the clearing the vehicles were still burning and would probably have gone on all night. Better this way: the smell of smoke would have kept the other animals away, since it meant that there was fire there and every animal feared fire. Also they were far away from the trees, so he didn't risk to cause a wildfire and therefore burning half of the forest.
The girl was still there and was desperately trying to crawl away. The ropes that immobilize her were very tight. Sobek could clearly tell by how deep the marks were on her wrists.
When she saw him coming, the girl froze and almost stopped breathing, staring at him in terror.
"Yeah. I guess the way I introduced myself isn't the best way to curry favor with a twelve-year-old girl..." Sobek thought, then he lowered his muzzle towards her.