A motorcyclist performing amazing tricks in front of a crowd of thousands.
Rolling around in the metal ball, the performer must be very careful.
Performing amazing tricks does not necessarily mean rolling around in the metal ball.
exists e1 s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(e1,x4) & of(x4,x5) & of(x5,x6) & n_thousand(x6) & n_crowd(x5) & n_front(x4) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_trick(x3) & a_amazing(s1) & Theme(s1,x3) & (x1 = x2) & n_motorcyclist(x1))
exists e1 e2 p1 p2 x1 x2 x3 x4.(n_performer(x4) & n_ball(x2) & of(x2,x3) & n_metal(x3) & while(e2,e1) & exists s2.(r_very(s2) & Theme(s2,x4) & a_careful(s2)) & Topic(e2,p2) & Actor(e2,x4) & v_must(e2) & in(e1,x2) & exists s1.(Theme(s1,x1) & a_around(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_roll(e1) & n_thing(x1))