A woman riding a scooter is in front of many other people riding scooters down the street.
A woman is riding a red scooter while leading many others on black scooters.
Riding a scooter doesn't mean riding a red scooter.  In front of many other people riding scooter don't necessarily imply that others are on black scooters.
exists e1 p1 x1 x2 x3 x6 x9.(n_street(x9) & n_people(x6) & exists e2 x4 x5 x7 x8.(in(x1,x4) & of(x4,x5) & Theme(e2,x8) & Actor(e2,x7) & v_ride(e2) & down(x8,x9) & n_scooter(x8) & (x5 = x7) & -(x5 = x6) & n_people(x5) & n_quantity(x5) & n_front(x4)) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_scooter(x3) & (x1 = x2) & n_woman(x1))
exists e2 e1 s1 s2 x1 x2 x3 x4.(while(e1,e2) & on(e2,x4) & n_scooter(x4) & a_black(s2) & Theme(s2,x4) & Theme(e2,x3) & Actor(e2,x1) & v_lead(e2) & -(x3 = x1) & n_person(x1) & n_person(x3) & n_quantity(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_scooter(x2) & a_red(s1) & Theme(s1,x2) & n_woman(x1))