A man on a snowboard jumping.
the man is a performer
Just because there is a man on a snowboard jumping, it does not necessarily mean that the man is a performer.
exists e1 x1 x2 x3.(a_topic(x1) & on(x1,x2) & Actor(e1,x3) & v_jump(e1) & (x2 = x3) & n_snowboard(x2) & n_man(x1))
exists p1 x1.(n_man(x1) & exists x2.((x1 = x2) & n_performer(x2)))