The teacher is getting a little too friendly with his student and is looking down her shirt.
A girl looks down her own shirt
"His" means the teacher is a male, so it is not a girl.  "Her" means he is looking down a girl's (her) shirt.
exists e1 e2 p1 x1 x2 x3.(n_shirt(x3) & of(x3,x2) & n_female(x2) & n_teacher(x1) & n_student(x2) & of(x2,x1) & n_male(x1) & down(e2,x3) & Actor(e2,x1) & v_look(e2) & with(e1,x2) & exists s1 x4.(n_little(x4) & rel(s1,x4) & r_too(s1) & Theme(s1,x1) & a_friendly(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1))
exists e1 s1 s2 x1 x2.(a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_look(e1) & n_shirt(x2) & a_own(s1) & Theme(s1,x2) & of(x2,x1) & n_female(x1) & n_girl(x1))