A man falls to his knees as he entertains the guest.
A man is on his knees
A man falling on his knees is on his knees.
exists e1 p1 x1 x2 x3.(n_guest(x3) & exists e2.(Theme(e2,x3) & Actor(e2,x1) & v_entertain(e2)) & n_male(x1) & n_male(x1) & as(e1,p1) & to(e1,x2) & n_knee(x2) & of(x2,x1) & Actor(e1,x1) & v_fall(e1) & n_man(x1))
exists p1 x1 x2.(on(x1,x2) & n_knee(x2) & of(x2,x1) & n_male(x1) & n_man(x1))