So I like to imagine walt straight up tells kleon he killed mike bc hes fucked up and has always hated kleon, “yeah I killed your baby daddy” (maybe even shows mikes body in the trunk) so without thinking kleon just goes into a blind rage. SORRY IF THIS IS DARK BUT yeah. Kleon’s gonna be a mess regardless of how he finds out walt killed mike and probably would be reckless and loud in how he gets revenge, I cant see him keeping his cool to losing the literal person hes staying alive for