The Raw Methodical

A ISTJ sun-Aries blends structure and follow-through with raw initiative. The methodical, dutiful, exacting of ISTJ meets the ignites, charges, refuses delay signature of Aries, producing someone who holds structure and follow-through like a private north star and channels it through raw initiative.

Under stress this fusion can say nothing rather than say imperfectly — the ISTJ 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.