The video doesn’t look like the gorilla was protecting the kid.
http://www.wcpo.com/news/local-news/watch-4-year-old-falls-into-cincinnati-zoo-gorilla-enclosure-silverback-killed-to-protect-child
Wow!! I agree. I hadn’t seen that footage before. Regardless, I’m glad the child is ok even though the gorilla had to be put down.