She knew the chance of contracting any disease this way was remote, but her promise calmed the mother and showed McHugh's son that his bad behaviour was being taken seriously.

她知道通过那种方式传染疾病的几率非常小，但她的许诺使对方母亲平静了下来，并且也让自己的儿子知道父母非常严肃地对待他的恶劣行为。