TL vs APX Game 1 Week 4 Summer Split WTF

At around 40:00 minutes in, a team fight begins around dragon side of mid and at 40:10 Ashe hits an arrow that appears to knock 3 people on APX back and allows TL to finish out the fight. Upon the replay review even Jatt asks, (What knocked them, real quick, at the very end of the fight?). There was never any more info about this particular subject and I just CAN'T let it go.... WTF WAS IT!!! Who? how? what? I know Ashes arrow stuns but I swear I've landed hundreds of them and I've never noticed them knocking people back...

Just FYI...

TLs team is.... Shen Olaf Victor Ashe Karma

While...

APXs team is....

Swain Rek'Sai Zillean Ezreal Braum

Any sane person with minimal knowledge of league champions knows the only champion outa these 10 that has an ability that can/could have some type of knockback is Braum. While Shen, Victor, an Ashe, all have stun-like-abilitys, none of them knockback correct?????. It almost looks like Dardochs Olaf causes the knockback, but it happens at the EXACT moment Fabbbyyys Ashe Ult Arrow hits. Did Jatt and I miss the memo that changed Ashes Ult to have a knockback in it?

I'm SOOOOO CONFUSED help me please!!!!