We really need a rating system to adjust good/bad players in ranked
I assumed Yi was coming from behind and killed the blast cone so TF couldn't use it to escape/to push him towards the assumed Yi, then look at my minimap, and realize he's completely ignoring us and doing chickens while I'm engaged on the TF just above him.
Afterwards, I ask him if he wants to pay attention and he starts raging and threatens to intentionally feed.
This person has climbed from Gold to almost Diamond by spamming Yi, without actually improving their awareness. There should be additional controls to catch these players and keep them at a suitable MMR.