Only feet are visible above the water.
There are feet with socks still on seen above the water.
Just because only feet are visible does not mean that they have socks on.
exists s1 x1 x2.(n_water(x2) & above(s1,x2) & Theme(s1,x1) & a_visible(s1) & all x3.(n_foot(x3) -> (x1 = x3)) & n_foot(x1))
exists e1 p1 s1 s2 x1 x2.(n_water(x2) & for(p1,e1) & above(e1,x2) & Theme(e1,x1) & v_see(e1) & a_on(s2) & Manner(p1,s2) & a_still(s1) & Manner(p1,s1) & exists x3 x4.((x1 = x3) & with(x3,x4) & n_sock(x4) & n_foot(x3)))