A skier is heading into a grove of trees.
The man, an amateur skier, has tried a ski run that is too hard and is careening out of control down the hill.
The skier may be professional or amateur. Heading into grove of trees does not mean that he is careening out of control.
the skier does not have to be careening out of control, in order to be heading into a grove of trees. there is no mention in first sentence that he tried a ski run that is too hard.
Just because a skier is heading into a grove of trees doesn't mean the skier is a man.