He probably just didn’t want to see you eaten by a lion.
As you no doubt know you’re not supposed to get out of your vehicle in the park, except at specific places. I remember us sitting in our car at the edge of a large pool watching the (very dangerous) hippos splashing about near the (very dangerous and very well concealed) crocodiles. Two absolute gonks pulled up in their car, jumped out, ran to the water’s edge (near the crocodiles) took a load of pictures of the hippos then ran back to their car oblivious to the fact they’d just escaped with their lives.
To be honest thinking about your situation they were probably angry at you for inadvertently breaking the unwritten rules about not jumping your position in the imaginary queues to see things. We got some of that when we pulled up alongside someone to ask what they were looking at.