There is a woman in a black jacket and sunglasses and a man in a white shirt with his back turned.
A man turns his back just as he and a women were about to get their picture taken.
There is no reason given why the man turns his back. One cannot infer that he purposely or accidentally turns his back. There is no mention of photographing anyone, so the inference of getting their picture taken is not valid. It is impossible to infer at what instant the man turned his back, so the time indication of "just as" is an invalid inference.
exists p1 x1 e1 s1 s2 x2 x3 x4 x5 x6 x7 x8 x9 x10.((x1 = x2) & subset_of(x5,x2) & subset_of(x7,x5) & in(x7,x8) & with(x8,x9) & Theme(e1,x10) & v_turn(e1) & (x9 = x10) & n_back(x9) & of(x9,x3) & n_male(x3) & n_shirt(x8) & a_white(s2) & Theme(s2,x8) & n_man(x7) & subset_of(x6,x5) & n_sunglass(x6) & subset_of(x3,x2) & in(x3,x4) & n_jacket(x4) & a_black(s1) & Theme(s1,x4) & n_woman(x3))
exists e1 p1 s1 s2 x1 x2 x3 x4.(Topic(s2,p1) & Actor(s2,x3) & a_about(s2) & exists e3 e2 x5.(Theme(e3,x4) & Actor(e3,x3) & v_get(e3) & Theme(e2,x5) & v_take(e2) & (x4 = x5)) & n_picture(x4) & of(x4,x1) & n_thing(x1) & n_woman(x3) & r_back(e1) & a_just(s1) & Manner(e1,s1) & as(e1,x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_turn(e1) & n_his(x2) & n_man(x1))