A skateboarding youth does a trick on a rail.
A young boy showing his new skateboard tricks to his friends.
The youth is not necessarily a boy and they are not necessarily showing their new skateboard tricks to their friends.
Just because someone is doing skateboarding tricks does not mean they are new skateboard tricks or he is showing his friends.
The trick is not necessarily new and the boy could just be playing alone, instead of showing tricks to his friends.