A young person doing a bike trick on a trunk of a tree.
A young man performs in front of his friends.
Just because a person is doing a bike trick doe not mean he is a man. Doing a trick does not mean he is doing the trick in front of his friends.
exists e1 s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & on(x3,x5) & of(x5,x6) & n_tree(x6) & n_trunk(x5) & n_trick(x3) & of(x3,x4) & n_bike(x4) & (x1 = x2) & n_person(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(in(e1,x2) & of(x2,x3) & n_friend(x3) & of(x3,x1) & n_male(x1) & n_front(x2) & Actor(e1,x1) & v_perform(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))