A runner winces as he runs.
His leg fell off while he was running.
No one just winces if their leg fell off.
exists e1 p1 x1.(exists e2.(Actor(e2,x1) & v_run(e2)) & n_male(x1) & as(e1,p1) & Actor(e1,x1) & v_wince(e1) & n_runner(x1))
exists e1 p1 s1 x1 x2.(n_male(x1) & n_male(x1) & n_leg(x2) & of(x2,x1) & exists e2.(Actor(e2,x1) & v_run(e2)) & while(e1,p1) & a_off(s1) & Manner(e1,s1) & Actor(e1,x2) & v_fall(e1))