Before onlookers in a park, a man in a black shirt and rollerblades slides backward down a railing.
A man in a black shirt practices his new rollerblading moves.
Just because a man rollerblades slides backward down a railing it does not mean the man practices new rollerblading moves.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(before(e1,x6) & in(x6,x7) & n_park(x7) & n_onlooker(x6) & a_backward(s2) & Manner(e1,s2) & down(e1,x5) & n_railing(x5) & Actor(e1,x1) & v_slide(e1) & in(x1,x2) & subset_of(x4,x2) & n_rollerblade(x4) & subset_of(x3,x2) & n_shirt(x3) & a_black(s1) & Theme(s1,x3) & n_man(x1))
(-x)