A bike rider is doing performance tricks.
A biker is idling at a stoplight.
Idling means one is just sitting there, the opposite of performance tricks.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_trick(x3) & of(x3,x4) & n_performance(x4) & n_rider(x1) & of(x1,x2) & n_bike(x2))
exists e1 x1 x2.(at(e1,x2) & n_stoplight(x2) & Actor(e1,x1) & v_idle(e1) & n_biker(x1))