Here are two sentences that you might consider adding to your group’s social contract:

If a PC is one small step away from death, let that character’s player know where they stand — to borrow a chess term, tell them that they’re “in check.” And if something your group is about to do is going to bring the adventure — or perhaps the entire campaign — to a screeching halt, take a quick break, share that with your players, and come up with a solution.

This quick bit of advice is in the same vein as ben robbins’s post about passing the ball, GameCraft’s thread about multi-directional feedback and the idea of talking things out when a PC’s life is on the line.

When it comes to in-game events that can have serious (and often unintended) negative consequences, sometimes there’s just no substitute for a quick metagame discussion to keep your game flowing smoothly.