The children are wearing black tights while hopping.
Children in black tights are bound in place.
If the kids are hopping they aren't bound in place.
exists e2 e1 s1 x1 x2.(n_child(x1) & while(e1,e2) & Actor(e2,x1) & v_hop(e2) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_tights(x2) & a_black(s1) & Theme(s1,x2))
exists e1 s1 x1 x2 x3.(in(e1,x3) & n_place(x3) & Theme(e1,x1) & v_bind(e1) & in(x1,x2) & n_tights(x2) & a_black(s1) & Theme(s1,x2) & n_child(x1))