The Raw Self-reliant

A ISTP sun-Aries blends hands-on mastery with raw initiative. The self-reliant, mechanical, observant of ISTP meets the ignites, charges, refuses delay signature of Aries, producing someone who holds hands-on mastery like a private north star and channels it through raw initiative.

Under stress this fusion can say nothing rather than say imperfectly — the ISTP default of withdrawal-into-system collides with the Aries pull toward raw initiative.

Locked-in mode: they argue with the room until the problem reveals its shape.