Walk away before you say the thing you can’t unsay.

Anger moves faster than judgment, and the sentence that does the real damage usually arrives when you are already past the point of choosing it. Everything else in an argument can be repaired. The one cruel accurate line tends to stay in the other person’s head for years, and you cannot take it back by apologising well. Leaving the room is not weakness, it is getting out before the part you will regret.

Decide now what your exit looks like: I need ten minutes, then actually go. Use it the next time your chest gets hot. You can always come back and say the careful version.