Will say it again... ALWAYS cover for your partner.
If you let him get hung out to dry and then gets reamed by the coach it hurts you BOTH as a team.
If its someone you don't like and have requested not to work with them, but still get assigned with that person. COVER for them anyways.
Having trolled this forum for a while I have seen some people say some silly *** stuff (myself included..lol) but, I make a mental note for some of the people who say things like "screw my partner this and screw my partner that" or something to that effect, and I NEVER EVER want to work with them.
For 6-7 innings you are married to that person "for better or worse" ... get divorced AFTER the game.