"OpenAI Five does not contain an explicit communication channel between the heroes’ neural networks. Teamwork is controlled by a hyperparameter we dubbed “team spirit”"
The bots presumably "learned" that the other heroes act the way that the bot would have acted were they in that position (i.e. all my allies run the same algorithm, so I can predict what they would do)
"OpenAI Five does not contain an explicit communication channel between the heroes’ neural networks. Teamwork is controlled by a hyperparameter we dubbed “team spirit”"
- https://blog.openai.com/openai-five/