A man in the red shirt tried to hang onto the rock while three others watched.
That is playing water games.
It wouldn't be possible to hang onto the rock while playing water games.
exists e1 p1 s1 x1 x2 x3.(n_person(x2) & n_rock(x3) & n_shirt(x2) & a_red(s1) & Theme(s1,x2) & Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e3 e2 x4 x5.(while(e2,x4) & Theme(e3,x5) & v_watch(e3) & (x4 = x5) & -(x4 = x2) & n_person(x4) & card_eq_3(x4) & onto(e2,x3) & Actor(e2,x1) & v_hang(e2)) & in(x1,x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_game(x2) & of(x2,x1) & n_water(x1) & n_thing(x1))