Barry watched as Bart disappeared, so similar to how Wally had all those years ago. Barry felt the lightning strike hit his body, then nothing.
:::
It might have been seconds, minutes, even days before he saw Bart running beside him. The blonde speedster tried to slow down, but the attempts were futile. He just continued running, running into nothing but white.
The speedforce.
Somehow the word came to mind.
Barry had heard of this place before, where all speedsters draw their power from.
And he knew, though he had no idea how, that he was there, trapped.
And that was all.
:::
When Barry managed to focus his mind again he took in his surroundings.
Bart was to his left and to his right, was a boy, with eerily familiar bright orange hair. Through the slits of the cowl, long since torn to shreds, Barry could see bloodshot, ragged emerald eyes.
Then there was nothing, again.
:::
He veered his toward the familiar college-aged kid clad in an outdated yellow costume beside him.
A picture from Christmas the past year appeared in his mind, a little girl with orange pigtails, a splatter of freckles across her nose, red flash footy pajamas, and the same vivid emerald eyes. The four-year-old was clutching the toy Batman she had received from "Uncle Dickie" and "Aunty Zee" that year, and trying to keep up with her newly developed speedster family members, Barry's twins, Dawn and Donnie. That little girl was most likely the man beside Barry's daughter, Iris Paula West.
There was no doubt in Barry Allen's mind that his beloved nephew that had given his life for the world about five years ago was running beside him, bringing back memories from very different circumstances, some good, some bad.
But he forgot.
:::
The teenaged supposedly dead hero took no notice of his uncle, or his cousin's son's presences. Bart too was staring straight ahead at the endless nothingness before them. Their mouths were moving, but no words came out, at least that Barry could hear. Wallace Rudolph West aka Kid Flash the first was mouthing the same distinct word over and over again, 'spitfire'. Whatever that meant, the fastest man alive didn't know.
Bart was saying the name 'Emily'. Did his grandson have a girlfriend? He didn't even know the boy knew an Emily.
It was only then did the speedster realize he was saying a word over and over again involuntarily too. 'Iris', his beautiful wife that he would give anything for played on his lips a million times over.
Finally Barry slipped.
This is my imagining of what happened to Wally, because we all know he couldn't just die. Artemis had their kid and quit the team after she found out. I imagined Irey and the twins speed developing over time. Lian is a part of their daughter's life and is being raised by Roy (Red Arrow) with Jade. Bart's Emily will come into play eventually come into play.
I have to warn you my knowledge of the official speedforce is limited to other fics and the cartoon Justice League and Justice League Unlimited. This is YJ world.