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I come back to this video time and time again, studying the Gorillas behavior. What's so interesting is that in the beginning of the video, it is assumed this is less than a minute since the boy fell, the Gorillas eyes are stoically yet frantically analyzing the people above. He can sense the unrest from the people, and therefore senses danger above. He was protecting the boy from what he thought the danger was coming from. He could also tell the boy was upset, and from each spot he moved from, he would be glancing up to see if the commotion was still going on, and didn't let the boy get far from him by gently bringing him close as he scoots away.