Dynamic queues. 4/1 means they are all chat banned.

With duo queue you could at least count on the players to watch their maps. Good luck with a 4/1 comp. Probably they had skype/curse. I was left alone in a world with no chat and pings. Thanks riot. At least season 5 I could get some interaction with pings. Now I really have to dive into their plan and HOPE that II'l get what they plan to do or I will be a leper isolated in top lane. Because it is way better to gank for their friends. Even if the dragon is down. Even if the enemy top laner is overextended.