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Mathematics education is implicated in and can reinforce societal inequities via harmful disciplinary practices, such as decontextualizing data or treating one's conclusions as objective. While some scholarship in the K-12 context describes possibilities for using math to understand and resist social injustices, this work predominantly utilizes statistics and computation, leaving proof unexplored despite its significant role throughout K-16 mathematics. I propose that proof instruction can be modified in service of teaching math for social justice while subverting harmful disciplinary practices. In this design-based research study, I explore how undergraduate math students can use skills from logic to discuss prisons and abolition. I develop a local instructional theory that accounts for cross-disciplinary parallels in students’ reasoning about assumptions and definitions.