The force needed to pull out a person immersed in quicksand is about the same needed to lift a car.... The trick for escaping is to slowly wiggle the feet and legs, allowing water to flow in. People float in quicksand so it is also impossible to sink all the way in, but quicksand usually forms at river estuaries, so a captive could drown at high tide.Quicksand, like lava, is a big kid fear, for some reason.
Attacks can generally be divided into two groups: predatory and defensive. Each calls for a different strategy.Oh, so you have to understand the bear's feelings?
Black and grizzly bears are capable of both types of attack. Those involving grizzlies tend to be defensive, when the animal feels threatened, according to Stephen Herrero, a bear expert at the University of Calgary and the author of "Bear Attacks: Their Causes and Avoidance." Playing dead then lets the bear know you're not a threat and can cause it to back off.
Black bears usually flee from humans, but when they do attack the motive tends to be predatory, and playing dead doesn't work. Neither does running away, since bears are much faster than humans.