[Grey nods, even though he's not particularly familiar with the technique(?) Manabu mentions. He doesn't comment on the tears, although internally he wishes he had a handkerchief or something on hand that he could discreetly deposit in Manabu's lap.]

The idea is to distract yourself, to pull your thoughts away from whatever's bothering you and into the present. Either through focusing on your senses, or through simple mental exercises, such as going over the times tables backwards.