A surfer catches a large wave.
The surfer caught a large wave and fell off his board.
Just because it's a large wave doesn't imply that the surfer fell off his board.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_wave(x2) & a_large(s1) & Theme(s1,x2) & n_surfer(x1))
exists e1 e2 s1 s2 x1 x2 x3.(n_board(x3) & of(x3,x1) & n_male(x1) & n_surfer(x1) & a_off(s2) & Manner(e2,s2) & Theme(e2,x3) & Actor(e2,x1) & v_fall(e2) & Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_wave(x2) & a_large(s1) & Theme(s1,x2))