Bruno experiences a troubling sensation in his stomach, feeling something growing within him. This unsettling feeling suggests that something inside him is changing or developing, causing him discomfort and possibly fear about what it might become.
He perceives that when this internal thing eventually emerges, it could lead to an intense emotional reaction, either with loud protest and anger at the injustice he feels or with overwhelming tears. This internal struggle highlights Bruno's sense of confusion and distress about his circumstances and feelings.