A young person is doing a trick on a bike.
A senior citizen rides his bike calmly.
He refers to a young person, not a senior citizen. He also says they are doing a trick on a bike which is the opposite or riding calmly.
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x3) & n_bike(x3) & n_trick(x2) & n_person(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 s2 x1 x2.(a_calmly(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x1) & n_male(x1) & n_citizen(x1) & a_senior(s1) & Theme(s1,x1))