A sheriff on a motorcycle leads a parade.
A man protecting the parade
leads doesn't always mean   protecting
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_lead(e1) & n_parade(x3) & on(x1,x2) & n_motorcycle(x2) & n_sheriff(x1))
exists e1 x1 x2 x3.(n_parade(x3) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_protect(e1) & (x1 = x2) & n_man(x1))