While scoring goals in Arena (League) matches, you are collecting Fan Excitement Points. These points are valuable after a match ends, since you can use them to fill in the milestone track that contains a variety of rewards.

After a match is finished, these points can be multiplied if you stop the arrow and watch a video ad or if you have the Diamond Season Pass.

If you do not wish to multiply Fan Excitement Points, you can always skip this step and continue to where you can tap on the points icon to fill a bar that unlocks great rewards.