The Night Race's strength lies not just in their Undead nature; more importantly, it's because they are numerous and have developed a comprehensive system of blood alchemy through years of self-study.
It's said they can extract fragments of memory from blood and track the source of the blood.
Olivia obtained Palmer's blood and memorized his scent, which itself was a threat, reminding him that he had been targeted by a member of the Night Race.
Palmer doesn't trust his luck, but he trusts his partner. They always operate together, and if Olivia truly comes seeking revenge, he believes Bologue, also an Undead, can handle it perfectly.
"Thank you so much, Bologue!"
"You are my best partner!"
Palmer shouted his thanks in his mind to his partner. As for guilt, the word guilt does not exist in Palmer's dictionary.
