On page 11 in the top left panel Jumbo says あーあいつ用が入ったからこねぇって。I’ve figured this one out for myself, but took a little digging so thought I’d parse it out in case it helps anyone else.
One point that helped me was to realize that 用が入った is more commonly 用事が入った which literally translates to a task was entered (into planner), but is a set phrase that really means something came up.
The other big help was to realize that こねぇ was a rough way of saying 来ない。The って then being the shortened quotation indicator.