I don't know, I'm dumb, but after reading
the afterword,... I kinda sympathize with tetsudo, kinda sad though (for me I guess cause that's what I understand).
Sad, because kamitezuna used tetsudo ( that's how I feel?), well I don't have any issues with that though as it is also beneficial for Tetsudo, preventing him from suicide(?), and a change of from his tiring life. Giving him a reason and a person to lean on.