The Hardest Gameplay Decision in League

When your team is 30 kills behind every game in soloq and the vote fails at 15 minutes...

Do you vote to surrender again at 18 minutes which almost always fails, or do you suffer an even longer time and survive to vote at 20 and beg that at least 4 people will ff, knowing that those 2 minutes will kill 10% of your remaining brain cells?