a lady is wearing all black with a whistle in the middle of rollerskaters.
A woman is a coach for a roller derby team.
Not every bunch of skaters is a team.
exists x1 x5.(n_middle(x5) & all x2.(n_thing(x2) -> exists e1 s1 x3 x4 x6.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & with(x2,x4) & in(x4,x5) & of(x5,x6) & n_rollerskater(x6) & n_whistle(x4) & Theme(s1,x3) & a_black(s1) & (x2 = x3))) & n_lady(x1))
exists p1 x1.(exists x2 x3 x4 x5.((x1 = x2) & for(x2,x3) & n_team(x3) & of(x3,x5) & n_derby(x5) & of(x3,x4) & n_roller(x4) & n_coach(x2)) & n_woman(x1))