This isn't much but it helps with beating Eric within the time.

ok- you have to get all the green fist icons while following Eric around
Jersey. The hint is that you DO NOT have to do everything he does,
meaning you don't have to grind the things he does to get the icons, and
to get the icons all you have to do is skate near them.

P.S the Fire That He Drops HURTS, so either go around it of jump over
it. (normal jump wont do it so bonless over them )