and there he is racing with his bike.

Wait wait wait let's start from the beginning okay?

the guy you saw racing was hatsumo. He's a popular guy and a racer at this moment. At the field he's racing with his motorcycle. And you were there because you were interested in him ofc,hes hatsumo park, the guy who's at your school... while you were going to get up, he shout at your direction どこに行くの ?(where you going?)

Oops,better run now.