A BMX biker in the air, following a jump off of a constructed dirt hill in a forest setting.
A BMX-er is riding in competition through a forest.
Sentence 2 says the biker is riding through but does not mention about jumping off a hill.
exists e1 e2 x1 x2 x3 x4 x5 x6 x7 x8 x9.(n_air(x3) & a_topic(x1) & of(e1,x6) & in(x6,x8) & n_setting(x8) & of(x8,x9) & n_forest(x9) & n_hill(x6) & of(x6,x7) & n_dirt(x7) & Theme(e2,x6) & v_construct(e2) & r_off(e1) & Theme(e1,x5) & Actor(e1,x4) & v_follow(e1) & n_jump(x5) & (x1 = x4) & in(x1,x3) & n_biker(x1) & (x1 = x2) & ne_org_bmx(x2))
exists e1 x1 x2 x3.(through(e1,x3) & n_forest(x3) & in(e1,x2) & n_competition(x2) & Actor(e1,x1) & v_ride(e1) & n_bmx-er(x1))