"Upon its coming in, the dying flame leaped up, as though it cried, “I know him! Marley's Ghost!” and fell again...."
See in text (Stave One)
Instead of having Scrooge shout this statement, Dickens personifies the dying flame doing so instead. The words combined with descriptive action ("leap up") creates a mental image of a dying fire suddenly jumping to life and announcing the arrival of the spirit.