Mercury opposite Pluto (orb 0.2°) puts the two planets face to face, with visible back-and-forth or tension. The orb is extremely tight; this aspect is one of the chart's strongest signals.
Here, Mercury in Capricorn in House 12 brings intellect, language, thought, and technique into House 12 (retreat, contemplation, long time, and possible confinement), with Capricorn style (structure, ambition, responsibility, and long construction); Pluto in Cancer in House 6 brings crisis, power, survival, and regeneration into House 6 (daily work, technique, and bodily discipline), with Cancer style (memory, protection, belonging, and family sensitivity).
Concrete conflict: this aspect sets intellect opposite Pluto: speech, analysis, or information can conflict with secrecy, power, crisis, or control. Visible angle: Mercury near the Rising sign (orb 2.8°) and Pluto near the Descendant (orb 2.6°) touch angles; this aspect is easier to notice through first impression, body language, reflexes, and entry style; also through direct relationships, partners, opponents, and the way others are met. The house conflict is between House 12 (retreat, contemplation, long time, and possible confinement) and House 6 (daily work, technique, and bodily discipline); pressure in one field tends to reactivate the other.