The Eternal Winter Lord had been absent from the Abyssal Empire for about four to five days, and the Earthly and Heavenly Ghosts, left without their master, were slightly disoriented.
Despite the Eternal Winter Lord not blaming them, both the Earthly and Heavenly Ghosts believed that his personal expedition was entirely due to their previous failure.
Now that the situation had progressed to this point, the Eternal Winter Lord didn't ask them to do anything else, merely to keep in touch regularly and report on "Banning's" location.
In terms of surveillance, the Earthly Ghost controlled snakes, and the Heavenly Ghost controlled birds. They cooperated with each other, working in shifts day and night, watching Banning closely 24/7. They would immediately notice if he left Delis Town.