The teen jumps the hill with his bicycle.
A teenager is a professional BMX rider
Just because teen jumps the hill with his bicycle doesn't imply teenager is a professional BMX rider.
exists s1 x1 x2 x3.(n_bicycle(x3) & of(x3,x1) & n_male(x1) & n_jump(x1) & a_teen(s1) & Theme(s1,x1) & a_topic(x1) & with(x1,x3) & n_hill(x2) & (x1 = x2))
exists p1 x1.(exists s1 x2 x3.((x1 = x2) & n_rider(x2) & (x2 = x3) & ne_org_bmx(x3) & a_professional(s1) & Theme(s1,x2)) & n_teenager(x1))