>>528528474
I always got the impression that Spamton saw Tenna's death as an inevitability that couldn't be changed no matter what. He blames Tenna being doomed by the prophecy for the caller ghosting him.
I think he eventually developed a murder-boner where he thought that if Tenna HAD to die, he had to be the one that did him in. The reveal that Tenna kept the pipis did affect Spamton but he'd already completely accepted that the guy was gonna die very soon and went back into Kris's pocket anticipating his death.