A person rides a bike down a rocky hill.
Someone riding their bike while their friends watch from on top of the hill
Just because someone is riding their bike doesn't mean they have friends watching.
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & down(x2,x3) & n_hill(x3) & a_rocky(s1) & Theme(s1,x3) & n_bike(x2) & n_person(x1))
exists e1 e2 x1 x2 x3 x4 x5 x6.(n_hill(x6) & on(e2,x5) & of(x5,x6) & n_top(x5) & r_from(e2) & Actor(e2,x1) & v_watch(e2) & while(e1,x4) & n_friend(x4) & of(x4,x1) & n_thing(x1) & n_thing(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bike(x3) & of(x3,x1) & (x1 = x2) & n_person(x1))