Just a tip because it happened to me tonight is to never take a "win" for granted had one person with me and got the whole team into a chat before game even though i didn't know them we did extremely well until the end when we had their core to 10% and thought oh they tried to run the OP buff and we thought oh we are about to win lets go stop them which we did and they started to push one of our inhibitors and all of us thinking don't worry we will run up and finish the core but they had a Grux/Feng combo take out our inhibitor and core before we could even get back to heir core.

Summary: Don't risk a win just to showboat and never underestimate a character in undefended situations.