There is nothing he can do, because the political reform movement he struggled for a lifetime still failed, and he has no strength to fight back.
The feelings expressed are Mr. Tan Sitong's deep and passionate patriotic feelings, his pride as a "revolutionary" to some extent, and his regret for the complete failure of the reform and reform.
What you should learn is his patriotism and sacrifice (he could have run away, but he refused to run away. He said, "Political reforms in all countries are born out of bloodshed. Today, China has never heard of any bloodshed caused by political reform, and this country is not prosperous. If so, please start from the beginning. " So he died generously, hoping to use his death to inspire more people to actively explore the road to saving the country.
This "subordinate" is the notorious Yuan Shikai.
The emperor is the hapless Emperor Guangxu.