A person with a helmet is riding a bike i the grass and dirt.
Someone speeds off on their dirt bike to evade their attackers.
Just because someone is on a bike, doesn't mean they are speeding. Just because someone is riding, doesn't mean they are trying to evade their attackers.
exists e1 e2 x1 x2 x3 x4 x5 x6 x7.(n_dirt(x7) & n_grass(x6) & subset_of(x7,x5) & subset_of(x6,x5) & Theme(e2,x5) & Actor(e2,x1) & v_i(e2) & with(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_bike(x4) & (x2 = x3) & n_helmet(x2) & n_person(x1))
exists p1 s1 x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & Topic(x2,p1) & exists e1.(Theme(e1,x4) & Actor(e1,x2) & v_evade(e1)) & n_attacker(x4) & of(x4,x1) & n_thing(x1) & n_thing(x1) & n_bike(x2) & of(x2,x3) & n_dirt(x3) & of(x2,x1) & n_speed(x1) & a_off(s1) & Theme(s1,x1))