why would you afk in a 1v1?

so i just had the average scenario we all know it. you stomp someone in ranked and they say "bla bla fed you 1v1 me you have no chance you suck youre shit"

so you agree to 1v1 them, you say you let them kill you 3 times to give them an advantage. said done. now what? you kill them 5 times in a row and then they go afk... and flame from the fountain. even tho i told them i muted them.

like wtf? why would you afk in a fucking 1v1? i even said "lets both leave the game so it gets closed" but no. rather stay in fountain and flame how shit the other person is even tho i started the game off 3/0 and on lv 4 with the enemy being on lv 1. but hey i went 3/5 after that. time to afk and flame.

like why would you do that? if you alrdy challenge me to a pointless stupid 1v1, dont you at least have some pride? i mean come on thats the most embarassing thing i ever saw in any online game.