A common technique your opponent may use in a deposition, particularly if he is older or more experienced than you, is to rattle your concentration with obnoxious behavior such as improper objections, loud sighs, rattling of a newspaper, etc.
The goal of the ... 12 rules is to align the interests of clients/customers and service providers to the fullest extent possible. The rules are not perfect, and can be improved. But this model works--if you work at it. If you follow these rules by building a disciplined culture at your shop where they are enforced and kept alive, your clients and firm both benefit as you go along.