I don't think some people have a good understanding of just how powerful animals are. It's hard for me to believe that people really think they have a chance against a crocodile or a grizzly. Animals like that can rag doll a grown man effortlessly.
And yeah going for the eyes sounds like a good plan. It's definitely what I do. But it's like Mike Tyson said, "Everybody has a plan until they get punched in the mouth". Everyone has a plan until a grizzly bear is throwing them through the air. What is plan B after you tried to poke the crocodiles eyes but it tore your arms off instead?