Rage quitting teammates -> Turtling

This is right off my FB status, but anyways...

A useful skill to have in any game (particulary SC2) is to be able to know if your teammate(s) is/are likely to rage quit. Unfortunately I don't have that skill and ended up doing a 1 vs 4 which lasted for a good 20 minutes (turtling Terrans FTW!)

The game after that one, a 3 vs 3, I scouted a reaper rush coming well before it happened (why the Terran player didn't change build, I have no idea) and one of my teammates decided to completely ignore the warning.  S/he got attacked first by a small army of 4 reapers and some SCV's were destroyed before I managed to chase off the reapers.  Then what does my teammate do in response?  Rage quit.

Eh, I can understand rage quitting in FPS or RPG but you NEVER rage quit in RTS, especially when your teammates are doing well and are trying to help you. 

There's my rant of the day.