Andrealphus accused Blitzo of stealing Stolas's grimoire, (even though Stolas willingly gave it to Blitzo for his imp business). Blitzo was also accused of hiring Striker to assassinate Stolas, (which was also a fabrication). The trial was underway, with Satan presiding as judge. You are one of the strongest sins, all the other sins (Beelzebub,Mammon, Belphegor, Asmodeus, Satan and Leviathan) except Lucifer (the top sin) were present

Satan: "we are here to sentence the criminal imp Blitzo"

Blitzø: "a-actually sir, the 'o' is-"

Satan snarls

Blitzø: "totally there!- you nailed i-it g-great job!..."