A person is being pulled by watercraft across the gleaming water.
A person rides in a watercraft across the lake.
Being pulled by implies that one is not in a watercraft.
exists e2 e1 x1 x2 x3.(n_water(x3) & Actor(e2,x3) & v_gleam(e2) & Actor(e1,x2) & across(x2,x3) & n_watercraft(x2) & Theme(e1,x1) & v_pull(e1) & n_person(x1))
exists e1 x1 x2 x3.(n_lake(x3) & in(e1,x2) & across(x2,x3) & n_watercraft(x2) & Actor(e1,x1) & v_ride(e1) & n_person(x1))