After 1 week without internet I played a ranked game just now. At first we were even. Then we started losing pretty hard and everyone was fighting with everyone. Suddenly we win 1 team fight and Vayne gets a Quadra kill and gets her full build. Next team fight we just rush them and Vayne makes another Quadra. Their fed Ezreal was about to get away but he kept fighting me next to his Fountain and just as he saw Vayne and tried to use E to blink to the fountain I used E at the right time and sent him flying towards Vayne which gave her a Penta Kill and us the win. I have no idea how we won..probably luck but still..when we made that final ace and Vayne made the Penta I was yelling like the guy in this video:
GG WP