Just let the enemy have the buff if it's a 5 man invade
Don't stay and watch when your jungler is over at the Blue with no interest in coming to do something with the top laner, leave. If I had a dollar for every time I've seen people die and burn summoners when they get invaded, despite the fact that they could've just walked away is stupid. Don't be the bot Lane that thinks they can 2v5.
If people on your team don't know how to properly fight out one, don't. An early double kill can change the course of the game a lot.