Father is pushing his son on the track.
A father pushes his son on the track to avoid being hit by a derailed train.
There are many reasons to push someone on a track, only one of those reasons is to avoid being hit by a derailed train.
exists e1 x1 x2 x3.(n_track(x3) & n_son(x2) & of(x2,x1) & n_male(x1) & ne_nam_father(x1) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_push(e1))
exists e1 p1 x1 x2 x3 x4.(n_track(x4) & Topic(e1,p1) & exists e2 p2.(exists e4 e3 x5.(Actor(e3,x5) & n_train(x5) & Theme(e4,x5) & v_derail(e4) & Theme(e3,x1) & v_hit(e3)) & Topic(e2,p2) & Actor(e2,x1) & v_avoid(e2)) & on(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_push(e1) & n_son(x3) & of(x3,x1) & n_male(x1) & n_father(x2) & n_father(x1))