A man on a bike hit by a vehicle sitting on the floor holding his head while others watch.
A car/pedestrian accident recently happened
Sentence 1 doesn't specify what kind of vehicle hit the man. Sentence 2 specifies a car/pedestrian accident.
exists e1 e2 e3 p1 x1 x2 x3 x4 x5 x6 x7.(n_person(x6) & n_head(x7) & of(x7,x6) & n_male(x6) & n_floor(x6) & a_topic(x1) & on(x1,x2) & Actor(e1,x4) & for(e2,e3) & exists e4 x8.(Actor(e4,x8) & v_watch(e4) & -(x8 = x6) & n_person(x8)) & while(e3,p1) & Theme(e3,x7) & Actor(e3,x5) & v_hold(e3) & on(e2,x6) & Actor(e2,x5) & v_sit(e2) & (x4 = x5) & n_vehicle(x4) & Theme(e1,x3) & v_hit(e1) & (x2 = x3) & n_bike(x2) & n_man(x1))
exists e1 s1 s2 x1.(a_recently(s2) & Manner(e1,s2) & Actor(e1,x1) & v_happen(e1) & n_accident(x1) & a_car/pedestrian(s1) & Theme(s1,x1))