If you got confused like I did: Refer back to chapter 7, for the first mention of the Witch. And of course the acorn was featured in the chapters leading up to this one.
In this chapter, the panels with the white border are a flashback.
@Tyco2003 The trip is Kuremi's past. He lost his memory after being put into cryogenic sleep and forgot his mission. Kuremi is not a normal hedgehog after all and is a fae. I don't know if Arthur is immortal or not. The acorn was not delivered to him and was launched as firework, we don't know if that is the correct way to use it.