Board Thread:Site Discussions/@comment-452598-20140128195939/@comment-452598-20140129183039

Yes, that is true, but they are granted super form moves like  invincibility and flight, and it requires ring energy to be maintained. I’m also basing this argument in Super Sonic’s abilities during the same boss, he also gains two new moves, just like Knuckles and Tails.

Cream says this: "Everyone! Watch your Ring count! You won't be able to use super transformation if you lose all your Rings." I can even try to grab a picture with the subtitles of her saying this.

Indeed inconsistent, but it would be wrong to compare different games in that area, because we don’t know if they were inconsistent in Heroes as they were in Generations, specially because Heroes came first.