Yes, we are all fascinated (or abhorred) by the inclusion of a few CGI dinosaurs in Terrence Malick's 'Tree of Life'. Personally, I enjoyed the dinosaurs thoroughly, but...
Why did the predatory dinosaur (Wikipedia says Ornithomimus) let the wounded Parasaurolophus live? Wikipedia says the Ornithomimus:
...places its foot on the Parasaurolophus' neck, preparing for the kill, but then reconsiders after watching it struggle.
In other words, Wikipedia suggests the dinosaur committed an act of mercy. But can we be sure that the predatory dinosaur didn't let the injured dinosaur live for some other reason, perhaps because the injured dinosaur was sick? Could the 'mercy' in fact have been an act of self-preservation? Something else?