Moon square Mercury (orb 1.6°) creates concrete friction between the two planets. The orb is very tight; this describes a stable character pattern more than a passing reaction.
Here, Moon in Aries in House 8 brings personal dream, play, inner child, childhood imprint, mother figure, mother image, optimism, and inner rhythm into House 8 (sexuality, shared power, crisis, and invisible bonds), with Aries style (initiative, speed, confrontation, and direct action); Mercury in Cancer in House 11 brings intellect, language, thought, and technique into House 11 (networks, audience, groups, ideas, ideologies, political beliefs, and collective projects), with Cancer style (memory, protection, belonging, and family sensitivity).
Concrete friction: this aspect creates tension between personal dream and intellect: thought can cut the play instinct, or the dream can overflow rational wording. House 8 (sexuality, shared power, crisis, and invisible bonds) is in friction with House 11 (networks, audience, groups, ideas, ideologies, political beliefs, and collective projects); this can create blockage, inhibition, overreaction, or repeated conflict between the two fields.