I will provide a different view.
If you assume you know why the problem is happening, and you act on that, and you are wrong, you are doing the player, and your game, a disservice.
Whatever happened to asking? When in doubt talk about problems.
Maybe the player really isn't a good tactician, and doesn't understand that the challenges are geared for a party that is cooperating.
Maybe, you, as the GM, haven't actually been giving that player as much spotlight as you think, so they are trying to grab it where they can.
Maybe... seventeen other things. The point is that unless you find out why the player is doing this, your response to it is apt to be the wrong one.
When the party goes left, and another player goes right, that player is often trying to hog the spotlight. They want some 1 on 1 time.
If you assume you know why the problem is happening, and you act on that, and you are wrong, you are doing the player, and your game, a disservice.
Whatever happened to asking? When in doubt talk about problems.
Maybe the player really isn't a good tactician, and doesn't understand that the challenges are geared for a party that is cooperating.
Maybe, you, as the GM, haven't actually been giving that player as much spotlight as you think, so they are trying to grab it where they can.
Maybe... seventeen other things. The point is that unless you find out why the player is doing this, your response to it is apt to be the wrong one.