A man spinning a skateboard in his hands while people watch.
A man is rollerblading.
Rollerblading and skateboard are different.
exists e1 p1 x1 x2 x3 x4.(a_topic(x1) & exists e2 x5.(Actor(e2,x5) & v_watch(e2) & n_people(x5)) & while(e1,p1) & Theme(e1,x3) & Actor(e1,x2) & v_spin(e1) & in(x3,x4) & n_hand(x4) & of(x4,x1) & n_male(x1) & n_skateboard(x3) & (x1 = x2) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_rollerblade(e1) & n_man(x1))