A man with a stroller watches another man with a camera.
A man observing another man with a camera.
Watches is a synonym of observing.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & with(x3,x4) & n_camera(x4) & n_man(x3) & -(x3 = x1) & n_man(x1) & n_man(x1) & with(x1,x2) & n_stroller(x2))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_observe(e1) & with(x3,x4) & n_camera(x4) & n_man(x3) & -(x3 = x1) & n_man(x1) & n_man(x1) & (x1 = x2))