Person riding dirt bike on track while others stand by track
Friends tackle woman on bicycle on dirt track.
Others stand by track presumably to watch means they aren't friends tackling the cyclist.
(x)
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x2) & Actor(e1,x1) & v_tackle(e1) & on(x2,x4) & n_track(x4) & of(x4,x5) & n_dirt(x5) & on(x2,x3) & n_bicycle(x3) & n_woman(x2) & n_friend(x1))