Three children, two girls and one boy, in martial art stances, standing on the hard-wood floor of a large room.
The teacher is late.
Just because there are children in martial art stances, that does not mean there is a teacher around.  The hypothetical teacher has no mention of their timeliness, so their lateness can not be inferred.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7 x8 x9.(n_floor(x8) & a_hard-wood(s2) & Theme(s2,x8) & a_topic(x1) & rel(x1,x2) & subset_of(x4,x2) & on(e1,x8) & of(x8,x9) & n_room(x9) & a_large(s3) & Theme(s3,x9) & Actor(e1,x7) & v_stand(e1) & (x4 = x7) & in(x4,x5) & n_stance(x5) & of(x5,x6) & n_art(x6) & a_martial(s1) & Theme(s1,x5) & n_boy(x4) & card_eq_1(x4) & subset_of(x3,x2) & n_girl(x3) & card_eq_2(x3) & n_child(x1) & card_eq_3(x1))
exists s1 x1.(n_teacher(x1) & Theme(s1,x1) & a_late(s1))