Given this paragraph about a Tree well, why is it so dangerous for hikers, snowboarder, skiers and any snow practitioners

A tree well, also known as a spruce trap, is the space around a tree under its branches that does not get the same amount of snow as the surrounding open space. This creates a void or area of loose snow below the branches and around the trunk that is dangerous to any hikers, snowshoers, skiers, snowboarders, and snowmobilers who fall into them. If someone lands in such a well, often as a result of a fall, it can be too deep for them to climb up the surrounding loose snow before they are buried. Making the situation more dangerous, they often fall into the well head-first and as the result of an accident which could leave them injured or unconscious

It is dangerous because it creates an area of loose snow below the branches and around the trunk, and when someone will fall into this area it can be too deep for this person to climb up before they are buried. Another dangerous aspect is the fact that they could fall head-first which could leave them injured or unconscious.