A young man in a tank top doing a stunt on a skateboard.
A man is rollerblading.
you can't be on a skateboard while you are also rollerblading
exists e1 s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(x1,x2) & Theme(e1,x5) & Actor(e1,x4) & v_do(e1) & on(x5,x6) & n_skateboard(x6) & n_stunt(x5) & (x2 = x4) & n_top(x2) & of(x2,x3) & n_tank(x3) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1.(Actor(e1,x1) & v_rollerblade(e1) & n_man(x1))