Three firefighters enraged after a prank call.
Three firefighters are about to start shooting a themed porno.
Firefighters who are enraged after a prank call cannot simultaneously be shooting a themed porno.  Presumably the second group are actors in costume, rather than real firefighters.
exists e1 x1 x2 x3.(after(e1,x2) & n_call(x2) & of(x2,x3) & n_prank(x3) & Actor(e1,x1) & v_enrage(e1) & n_firefighter(x1) & card_eq_3(x1))
exists p1 s1 x1.(Topic(s1,p1) & Actor(s1,x1) & a_about(s1) & exists e1 p2.(exists e2 e3 x2.(Theme(e3,x2) & Actor(e3,x1) & v_shoot(e3) & n_porno(x2) & Theme(e2,x2) & v_theme(e2)) & Topic(e1,p2) & Actor(e1,x1) & v_start(e1)) & n_firefighter(x1) & card_eq_3(x1))