Take the opportunity to put in your foot and seize the heart of the enemy, proceed step by step.
When a host is so awkward that he does not know how to accommodate a guest, the guest may dictate the necessary proceedings on the host’s behalf. Thus the roles of the host an guest are reversed. The expression can also describe a pre-sumptuous person who takes someone else’s job into his own hands.
In this strategy, the guest is advised to usurp the host’s role. For instance, a warlord attacked by superior enemy forces may be compelled to seek help from his allies. He thereby assumes the role of the host, and the ally who comes into the rescue acts as the guest. Finding the host weak, the guest may secretly subvert the host’s authority and seize control of his troops. Having completed this, the guest becomes the host.