If Your Ally Engages, FOLLOW THEM.
Holy shit, I am so tired of just lining up a perfect gank only to watch as my laner continues to farm his minions while I try and 1 v 1 his fed opponent on my own.
Transitioning to midgame, our support/tank initiates perfectly, lining up their CC on the whole enemy team, ready for the team to follow up. But hey, I guess that was a good time to take Raptors, good job!
As the enemy closes in on our nexus, the support once again lines up a re-engage ready to change the course of the fight. Guess what the ADC does? Flashes out.
Unless you are hopelessly outnumbered, there is really no excuse not to follow up on a play.