The large white bird swoops down hovering above the water.
The large bird is preying over its meal.
Birds swoop over the water for reasons other than preying over its meal.
exists e2 e1 s1 s2 s3 x1 x2.(n_water(x2) & n_bird(x1) & a_white(s2) & Theme(s2,x1) & a_large(s1) & Theme(s1,x1) & for(e1,e2) & above(e2,x2) & Actor(e2,x1) & v_hover(e2) & a_down(s3) & Manner(e1,s3) & Actor(e1,x1) & v_swoop(e1))
exists e1 s1 x1 x2.(n_meal(x2) & of(x2,x1) & n_thing(x1) & n_bird(x1) & a_large(s1) & Theme(s1,x1) & over(e1,x2) & Actor(e1,x1) & v_prey(e1))