A man using a metal detector walking on the beach as people are in the water and on the beach.
Some of the people are surfing in the water.
people in the water does not imply they are surfing.
exists e1 p1 x1 x2 x3 x4 x5 x6 x8.(n_beach(x6) & n_beach(x6) & n_water(x8) & a_topic(x1) & exists p2 x7.(on(x7,x6) & in(x7,x8) & n_people(x7)) & as(e1,p1) & Theme(e1,x3) & Actor(e1,x2) & v_use(e1) & on(x3,x6) & n_walking(x3) & of(x3,x5) & n_detector(x5) & of(x3,x4) & n_metal(x4) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(n_water(x3) & n_people(x2) & in(e1,x3) & Actor(e1,x1) & v_surf(e1) & of(x1,x2) & n_thing(x1))