A group of boaters boating down a winding waterway.
The boats are tied to the dock.
The boaters are boating down a waterway which means that the boats aren't tied to the dock.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x4) & Actor(e1,x3) & v_boat(e1) & n_waterway(x4) & of(x4,x5) & n_winding(x5) & (x1 = x3) & of(x1,x2) & n_boater(x2) & n_group(x1))
exists e1 x1 x2.(n_dock(x2) & n_boat(x1) & to(e1,x2) & Theme(e1,x1) & v_tie(e1))