A police officer with a riot shield protects civilians.
A police officer is fending off a crazed shooter.
The police officer with a riot shield protects civilians but he isn't necessarily fighting off a crazed shooter.
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x5) & Actor(e1,x1) & v_protect(e1) & n_civilian(x5) & with(x1,x3) & n_shield(x3) & of(x3,x4) & n_riot(x4) & n_officer(x1) & of(x1,x2) & n_police(x2))
exists e1 s1 s2 x1 x2 x3.(a_off(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x1) & v_fend(e1) & n_shooter(x3) & a_crazed(s1) & Theme(s1,x3) & n_officer(x1) & of(x1,x2) & n_police(x2))