Mars square Pluto (orb 1.7°) creates concrete friction between the two planets. The orb is very tight; this describes a stable character pattern more than a passing reaction.
Here, Mars in Cancer in House 8 brings action, courage, competition, and effort into House 8 (sexuality, shared power, crisis, and invisible bonds), with Cancer style (memory, protection, belonging, and family sensitivity); Pluto in Libra in House 11 brings crisis, power, survival, and regeneration into House 11 (networks, audience, groups, ideas, ideologies, political beliefs, and collective projects), with Libra style (relationship, balance, negotiation, and sense of form).
Concrete friction: this aspect creates friction between Mars (action, courage, competition, and effort) and Pluto's crisis instinct: pressure can become domination, fear, or destructive escalation unless it receives a clear outlet. 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.