Moon opposite Mercury (orb 1.8°) puts the two planets face to face, with visible back-and-forth or tension. The orb is very tight; this describes a stable character pattern more than a passing reaction.
Here, Moon in Libra in House 5 brings personal dream, play, inner child, childhood imprint, mother figure, mother image, optimism, and inner rhythm into House 5 (creation, performance, and personal expression), with Libra style (relationship, balance, negotiation, and sense of form); Mercury in Aries in House 11 brings intellect, language, thought, and technique into House 11 (networks, audience, groups, ideas, ideologies, political beliefs, and collective projects), with Aries style (initiative, speed, confrontation, and direct action).
Concrete conflict: this aspect sets personal dream, childhood imprint, or mother image against intellect and language: what is imagined or remembered can contradict what is said. The house conflict is between House 5 (creation, performance, and personal expression) and House 11 (networks, audience, groups, ideas, ideologies, political beliefs, and collective projects); pressure in one field tends to reactivate the other.