Ok, so... Step 1. Get flare Step 2. Light flare Step 3. Throw the flare to the spinosaurus and let the T-Rex and it brawl it out Step 4. Become Chris Pratt and tame the velociraptors Step 5. Let the velociraptors eat the ankylosaurus Step 6. Rule the dinosaurs Edit: The T-Rex would have won, as it is an apex predator, and you control it with a flashlight, so it's not a problem