Competing bicyclists prepare for the start of a race.
The Bicyclists are going for a run.
Bicyclists would not go for a run, they would go for a ride. A bicyclist who was preparing for a race would not run.
exists e2 e1 x1 x2 x3.(n_start(x2) & for(e2,x2) & of(x2,x3) & n_race(x3) & Actor(e2,x1) & v_prepare(e2) & n_bicyclist(x1) & Actor(e1,x1) & v_compete(e1))
exists e1 x1 x2.(n_bicyclist(x1) & for(e1,x2) & n_run(x2) & Actor(e1,x1) & v_go(e1))