im a new player

i played hero showdown and i noticed everyone is doing 1v1 and the winner is waiting for the other 1v1 to finish so i just did that aswell next game there was 1 player randomly attack me and my teammate all the time even when he killed my teammate he shoots at me while i had an intense 1v1 it became a 2v1 and i lost so i locked in and did the attack on sight strategie to win but im confused now lol