When to give your partner

[rainmaker]

It's a judgement thing, as Jeff says. Here are some considerations:

Is p an old coot who has specifically stated or strongly inplied that he doesn't need help?

Is p fairly new, and might welcome a diplomatic intervention?

Have you and p worked together before so that you know what his response might be?

Is it the sort of game where you could say to coach B, "Look, he's not giving away the game, let's just get on with the game" (40 point spread in the last two minutes)?

Is one or the other of you being evaluated?

Is stepping in and correcting your partner at the right tme something you need to work on? Then you should have pre-gamed this, and you should use those criteria to decide.