There is a wave about to take down a surfer.
There is someone surfing.
A wave about to take down a surfer indicates someone surfing.
exists p1 x1 p2 s1 x2 x3.((x1 = x2) & Topic(s1,p2) & Actor(s1,x3) & a_about(s1) & exists e1 s2 x4.(a_down(s2) & Manner(e1,s2) & Theme(e1,x4) & Actor(e1,x3) & v_take(e1) & n_surfer(x4)) & (x2 = x3) & n_wave(x2))
exists p1 x1 x2 x3.((x1 = x2) & Time(x2,x3) & n_surfing(x3) & n_person(x2))