Yes, very serious ones which he specifically warns no one else better do because they will be prosecuted.
Even though he recommends no prosecution, what is to stop President Trump from having a new AG do it?
Nothing.
If Loretta Lynch refuses to, does that mean its over?
No. Her decision not to prosecute is hers alone. She tried to put it all on Comey, but even though he did not recommend prosecution, he put it back on her by saying Hillary did commit prosecutable crimes.
He gave her cover.
He told her she would not be reasonable should she decide to prosecute.