A singer doing a stage dive into the crowd.
A dancer practices alone
The first sentence is talking about a singer being on stage in front of a crowed. The second is talking about a dancer who is alone.
exists e1 x1 x2 x3 x4 x5.(n_crowd(x5) & a_topic(x1) & into(e1,x5) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_dive(x3) & of(x3,x4) & n_stage(x4) & (x1 = x2) & n_singer(x1))
exists x1 x2.(a_topic(x1) & r_alone(x1) & n_practice(x1) & of(x1,x2) & n_dancer(x2))