Actual 5v5 teamfights don't exist
If the game isn't a usual quick stomp, the "teamfights" that occur go typically so that one player hits an ability, often CC, and gets erased. Then it's easy to take down the rest of the enemies or baron/towers and end. I'm not sure if there has ever been intense teamfights, but as long as damage sources remain high there surely won't be those.
Jungle and if they wont to stop me from raiding their base they have to send a minimum of 2 players to even attempt to stop the troll. So I tell my team as soon as 2 of them come to stop me fight them 4v3 and win that and push. But, yeah I basically try to win my games via Objv.