Two men kickboxing, the man in the red shorts is kicking while the man in the black is blocking.
Two men are kickboxing each other.
Two men kickboxing, were explicitly mentioned in both sentences.
exists e1 e2 p1 s1 x1 x2 x3 x4.(n_black(x4) & n_shorts(x2) & a_red(s1) & Theme(s1,x2) & rel(e1,x1) & Actor(e2,x3) & v_kickbox(e2) & (x1 = x3) & n_man(x1) & n_man(x1) & n_man(x1) & card_eq_2(x1) & exists e3.(Actor(e3,x1) & v_block(e3) & in(x1,x4)) & while(e1,p1) & Actor(e1,x1) & v_kick(e1) & in(x1,x2))
exists x1.(all x2.(n_other(x2) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_kickbox(e1))) & n_man(x1) & card_eq_2(x1))