I'd like to vent about something

so last match. I lost. in ranked. I don't mind losing. screw the 20 LP thats not what am venting about. am venting about how we lost. so. we we're really ahead. and we could end. I had a personal issue come up and i had to leave. but i stayed for 2-3 minutes. I tped bot lane got turrets. went mid. won my team a team fight. I was sion. ulted in the middle of their team. and I died but I think it was a 1 for an ace trade. my team pushed down mid lane. got every single turret. and the nexus was open. all of my team were htting it. except. the shyvanna. she was for some reason. hitting minions . idk if she was bming the enemy team or not. but she just had no reason to do that. the enemy team respawned. the nexus was LITERALLY. 1 hit away from dying and the shyvanna would rather die than to hit it for some reason. and my time was up i went afk. i just came and saw that we lost. no surprise there. I had an important issue bigger than the game came up. and had to go. didn't get a ban or anything because I haven't afked in weeks (i actually never afked in a ranked game before this one) . but I 'd like to be able to report people that purposely don't end the game. first its disrespectful to the other team to bm them like that and 2nd its a waste of the rest of the team's effort. am not mad or anything that I lost but am mad at how that shyvanna decided its up to her to lose the game for the whole team. i literallt put in chat that I had to go and she decided not to end. if I stayed then we probably would have won but again its not about the win and it was something important and honestly i didn't even feel like playing or winning with her after she did that.