a young man is performing a roller-blade jump in front of a glass building.
a man on roller-blades for the first time
A man who performs a roller-blade jump in front of a glass building is not necessarily on roller-blades for the first time.
exists e1 s1 s2 x1 x2 x3 x4 x5.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & of(x2,x4) & n_building(x4) & of(x4,x5) & n_glass(x5) & in(x2,x3) & n_front(x3) & n_jump(x2) & a_roller-blade(s2) & Theme(s2,x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists s1 x1 x2 x3.(n_time(x3) & a_first(s1) & Theme(s1,x3) & a_topic(x1) & on(x1,x2) & for(x2,x3) & n_roller-blade(x2) & n_man(x1))