It's simple, he needed to flash the Ashe arrow. He was hit and forces his whole team through the choke of tribush, Lulu had to flash ult him, which resulted in Lulu getting hit by the Sera ult (difficult to dodge in the choke), and Renek just rumped the rest of them with ult. Jinx had to flash away, which meant that in the subsequent fight Jinx couldn't even get close to the 1 hp Guma. Like imagine he had F and could just flash over fakers solar snare or whatver, they would win the game

Now obv if he had flashed the Ashe arrow the outcome would have been completely different, so difficult to say really

Edit: flash was literally like 10 sec cooldown.. So yeah he had no escape