"The voices inside a person's heart are especially noisy, and this is especially true in safe and comfortable places. Some voices that are extremely important to your heart can only be heard clearly in those painful, uneasy, and dangerous moments." ——Gepard
Regardless of what Tail had actually done inside Luka's inner world, Luka clearly remembered those words.
"When facing Boothill's pitch-black muzzle, I discovered that Mr. Gepard was right. My heart was filled with peace, leaving only a single voice shouting over and over again, growing louder and louder until it drowned out everything around me... That voice said: 'Run! Run! Run! If you don't run, you're going to die!' That is the truest voice in my heart when I am deeply trapped in danger. I suppose this perhaps means I am not as strong as I thought..."
Chapter 239