You can also configure the response webhook for the path that exits from a node in case of timeout, also known as alternate flow. Configure timeout node webhook If you do this, the HTTP request body that is sent to the endpoint configured in Treble will add the following field to the request body: 
{
    "timeout_at": "2021-10-07 08:53:22.572123"
}
The response can also have new variables for the session that can be updated or created for later use in the session. That is, you can add them in the webhook response as part of the user_session_keys.