The Eris person carries a wound around exclusion and perceived injustice; the Mars person operates from immediate assertion and forward momentum. Where the Mars person acts, the Eris person feels unseen or bypassed, not because the Mars person intends this, but because Mars moves without checking the relational perimeter for who has been left behind. The sesquiquadrate (135°) locks them into a 3:4 ratio of friction: the Mars person's directness lands at an angle the Eris person cannot quite metabolize as honest aggression. Instead, it reads as careless dominance.

The Mars person experiences the Eris person as an obstacle that materializes only after action has begun. They do not stop the Mars person beforehand; instead, they erupt or withdraw once the Mars person has already committed to a direction. This creates a pattern where the Mars person feels suddenly accused of insensitivity they did not know they were committing, while the Eris person feels their concerns were never consulted in the first place. The Mars person may interpret the delayed reaction as manipulative or as an attempt to undermine their autonomy. The Eris person experiences the Mars person's refusal to slow down as confirmation that they do not matter in the decision-making process.

The concrete friction appears when the Mars person makes plans or takes initiative, starting a project, making a purchase, proposing a direction, and the Eris person responds with anger or withdrawal that feels disproportionate. The Mars person thinks, "I was just moving forward"; the Eris person thinks, "I was never asked." Neither is wrong. The sesquiquadrate prevents easy dialogue because the timing is off: Mars commits before Eris can speak, and Eris speaks after Mars has already invested. The Eris person's capacity to identify where power has been distributed unfairly becomes usable only if they name it before resentment hardens. The Mars person's ability to generate momentum could serve both if redirected through genuine consultation rather than assumption of consent.

The relational loop persists when the Mars person treats planning and action as a solo prerogative, and the Eris person voices objection or need only after resentment has calcified. The Mars person must learn that slowing to ask is not weakness; the Eris person must learn that speaking early is not manipulation. Without this shift, the sesquiquadrate keeps them cycling: Mars acts, Eris reacts, both feel justified in their grievance, and neither discovers that the other was not trying to exclude or control, only operating from a different clock.