A guitarist drops to his knees during a set.
the guitarist is playing in a concert
We have no idea if he is playing in a concert, he could be playing for a number of reasons.
exists e1 x1 x2 x3.(during(e1,x3) & n_set(x3) & to(e1,x2) & n_knee(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_drop(e1) & n_guitarist(x1))
exists e1 x1 x2.(n_guitarist(x1) & in(e1,x2) & n_concert(x2) & Actor(e1,x1) & v_play(e1))