Six people in a boat floating in the water.
Six people waiting to be rescued sit in a floating boat in the water.
There is not reference to any distress, if they are "waiting" to be rescued, by the six people in the first sentence, nor do we know if they are siting or standing in the boat from the first sentence.
exists e1 x1 x2 x3 x4.(n_water(x4) & a_topic(x1) & in(x1,x2) & in(e1,x4) & Actor(e1,x3) & v_float(e1) & (x2 = x3) & n_boat(x2) & n_people(x1) & card_eq_6(x1))
exists e1 e2 p1 s1 x1 x2 x3 x4.(n_water(x4) & in(e2,x3) & in(x3,x4) & n_boat(x3) & a_floating(s1) & Theme(s1,x3) & Actor(e2,x1) & v_sit(e2) & Topic(e1,p1) & Actor(e1,x2) & v_wait(e1) & exists e3.(Theme(e3,x2) & v_rescue(e3)) & (x1 = x2) & n_people(x1) & card_eq_6(x1))