The rider holds on as the horse rears onto his hind legs.
A rider hold on to a red horse.
The fact that the rider is on a horse that rears his hind legs does not imply that the horse is red or any other color.
exists e1 e2 x1 x2 x3 x4 x5.(n_leg(x4) & of(x4,x5) & n_hind(x5) & of(x4,x2) & n_male(x2) & n_horse(x2) & n_rider(x1) & r_on(e1) & as(e1,x2) & onto(e2,x4) & Actor(e2,x3) & v_rear(e2) & (x2 = x3) & Actor(e1,x1) & v_hold(e1))
exists e1 s1 x1 x2 x3 x4.(r_on(e1) & r_.(e1) & to(e1,x4) & n_horse(x4) & a_red(s1) & Theme(s1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_event(e1) & n_hold(x2) & of(x2,x3) & n_rider(x3) & n_thing(x1))