This part might get changed around in the final draft... I'm trying to show the happier memory getting interrupted by the fire, but I'm not sure if that's clearly presented. I might add speech to make it flow better, but also like the idea of having the flashback be silent. What do you think?
I think it's perfectly clear. You've got the wavy lines, and then the fiery borders moving in on the happier ones above. Lots of times flashbacks are silent. I don't think you need text at all, unless what's being said is part of the flashback, of course. But the message is clear here, in my opinion.