A man falling off of his surfboard.
A man wipes out while surfing.
He falls while surfing and not while standing out of the water.
exists e1 x1 x2 x3.(a_topic(x1) & of(e1,x3) & n_surfboard(x3) & of(x3,x1) & n_male(x1) & r_off(e1) & Actor(e1,x2) & v_fall(e1) & (x1 = x2) & n_man(x1))
exists e1 e2 s1 x1.(while(e1,e2) & Actor(e2,x1) & v_surf(e2) & a_out(s1) & Manner(e1,s1) & Actor(e1,x1) & v_wipe(e1) & n_man(x1))