Watching the Movie is Terrifying
When you see Marshall, Tippi, and other cast members try to escape the grasp of the huge lions, you feel your heart pound and your eyes open as wide as possible. You fail to acknowledge the fact that there is no CGI involved in the filming, and these people are actually, willingly, trying to avoid death while holding hands with it.
Source: IMDB
The finished product actually was quite depictive of the efforts the crew and production team put in. In the scene where the family comes face-to-face with the lions, you can see them running and hiding behinds wardrobes, lockers, and basically anything that they can find. The terror on their faces and the urgency in their body movements do feel as real as it can possibly get.