A man who is extreme biking down a trail.
A dad who is riding his mountain bike down the forest.
A man isn't always a dad. The bike is not necessarily a mountain bike. The trail doesn't have to be in a forest.
exists e1 p1 x1 x2.(a_topic(x1) & exists e2 s1 x3.(a_down(s1) & Manner(e2,s1) & Theme(e2,x3) & Actor(e2,x2) & v_bike(e2) & n_trail(x3)) & Topic(e1,p1) & Actor(e1,x2) & v_extreme(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3 x4 x5.(n_forest(x5) & a_topic(x1) & down(e1,x5) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bike(x3) & of(x3,x4) & n_mountain(x4) & of(x3,x1) & n_male(x1) & (x1 = x2) & n_dad(x1))