Sooo... either Annet's beam caused a temporal disturbance and made the beam shoot through at that moment back in time... or, judging by the whole in Charlie's chest, this is one of his memories that Cancer was reviewing, but it was violently interrupted and tainted by the beam shooting cancer. I'm gonna go with that one.
I think these last few and far between chapters are Snippy's flash back and the 'green' ones are a meanwhile in this neck of the woods. Three points of view: Here, there, and then. BEWARE THE MUG! I think I have a prediction!