Dang what crawled up his ass? Jack could think of so many possibilities for a joke but he would keep them to himself......Considering his mood, not my finger.
Such easily thought comical replies could exist in his head with getting impaled by Katsu right before getting ice cream. He dully noted her giving Katsu something but didn't really care what it was. Unless of course it contained the same thing within the object, such a thing would be funny.
When she returned she whispered something, "Man, I have no idea what you did to him, but what a prick. Well, now with all that time wasted, I say we get a triple cream pie sherbet." Jack would probably drown in his own saliva if he kept letting his mouth water at the thought of food. "Super sized, of course!" Jack could cut off his tongue after this because no words could describe how good it will taste and nothing else will be worth tasting.
"You must be trying to kill me." Jack managed to say jokingly while still thinking about ice cream.
He followed after her, grinning and eager to have his stomach rip due to all the planned consumption. The anticipation wasn't killing him, it was making him even happier to be alive. While everyone else trains he is going to go get an ice cream with a fair exuberant lady... Jack felt like a child somewhat, an "adult" shouldn't obsess over food that would normally be consumed by a child.