Indeed, warriors were responsible for being brave and fearless, while commanders only had their hearts left.
Lind appreciated the Bloodless Prince, but he did not appreciate the other's desire to kill him, just as he publicly claimed he did not want to live forever, only to retire when he got older.
In reality, he was willing to consider the pain of immortality after he experienced the boredom of eternal life. Once he reached Legendary Level, his life could easily span thousands of years, so his next goal was to become a legend.
If he weren't afraid of death, if he didn't want to live longer, why would Lind bother being an unpopular nanny for the Undead, frantically making his presence felt?
He was doing it to ensure the Undead recognized him as an important NPC, so they wouldn't easily lay hands on him.