What is the fine-grained topic of the following text: With leaden feet, and heart now changing from iciness to a strange sort of indifference, and a numbing sensation stealing over him, he sat there awhile, till, like the resting traveler in snows, he began to struggle against this inertness as the most treacherous and deadliest of symptoms. Only return the topic.
Struggling against emotional numbness and indifference