A tall black man in yellow pants shows his rollerskating skills, while pedestrians watch.
Man roller skates for a crowd to watch.
The usage of rollerskating skills implies technique, where roller skates just implies skating.
exists e1 p1 s1 s2 s3 x1 x2 x3 x4.(exists e2 x5.(Actor(e2,x5) & v_watch(e2) & n_pedestrian(x5)) & while(e1,p1) & Theme(e1,x3) & Actor(e1,x1) & v_show(e1) & n_skill(x3) & of(x3,x4) & n_rollerskating(x4) & of(x3,x1) & n_male(x1) & in(x1,x2) & n_pants(x2) & a_yellow(s3) & Theme(s3,x2) & n_man(x1) & a_black(s2) & Theme(s2,x1) & a_tall(s1) & Theme(s1,x1))
exists e1 p1 x1 x2 x3.(for(e1,x3) & Topic(x3,p1) & exists e2 x4.(Theme(e2,x4) & Actor(e2,x3) & v_watch(e2) & n_thing(x4)) & n_crowd(x3) & Actor(e1,x1) & v_skate(e1) & n_roller(x1) & of(x1,x2) & n_man(x2))