It happens. In the middle of a game, a player must leave. Perhaps there is sudden news of a family emergency. Perhaps he is attacked by a sudden bout of illness. Perhaps he is attacked by a BEAR! In any event, he has to leave.
When this happens, his teammates are left with the question “How do we carry on with the game?” Sometimes the question is “Bob had to leave. Can Jim play his boules?”
How does the game proceed?
The answer is a definite “It depends.”
If the context is a formal, organized competition, the first option is to replace the player who is leaving with another player. To do this, the affected team would call the umpire, notify him, and get his permission/approval for the change. (In the FIPJP world championships, the triples teams are required to have four members. The fourth member is a backup for just such situations.)
In a formal competition, if no replacement player can be found, the remaining players can NOT play the boules of the departed player. They must continue by themselves, with each player playing only his own boules.
Still… umpires have a lot of discretion in making decisions that allow competitions to continue smoothly. Each situation is unique, and a particular umpire in a particular set of circumstances might see other options.
If the context is a friendly game, the players can be more relaxed about following the letter of the law. The affected team would try to find a replacement player. Failing that, the remaining teammates could increase the number of boules they play.
Just as an umpire has a lot of discretion in making decisions in a formal competition, the players in a friendly game are free to continue in any way that is acceptable to both teams. The players might, for instance, simply stop the game, re-form the teams, and start again.
Where you run into problems is in a friendly but competitive game (no umpire) where one team is happy to proceed in a relaxed way, while the other team feels that “the rules are the rules”. In such a case, there can be disagreement about how to proceed.
At this point we have a human relationship problem, not a question about the rules of petanque. This is tricky territory. But if you can remember that this is not about the rules of petanque, but about getting along with people who you want to keep as friends for a long time, you’ll be OK. You’ll figure out something.