A man wearing red and black is balancing himself on the back wheels of a bicycle that is pointing up.
The back wheels are being used to balance someone.
"Back wheels are being used to balance someone" is a rephrasing of "balancing himself on the back wheels."
exists e1 e2 e3 s1 s2 s3 x1 x2 x3 x4 x5 x6.(n_wheel(x4) & a_back(s2) & Theme(s2,x4) & on(e2,x4) & of(x4,x5) & a_up(s3) & Manner(e3,s3) & Actor(e3,x6) & v_point(e3) & (x5 = x6) & n_bicycle(x5) & Theme(e2,x3) & Actor(e2,x1) & v_balance(e2) & n_male(x3) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_black(x3) & a_red(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists e1 p1 s1 x1.(n_wheel(x1) & a_back(s1) & Theme(s1,x1) & Recipient(e1,p1) & Topic(e1,x1) & v_use(e1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_balance(e2) & n_person(x2)))