It would mean that ability to go aggro and to seize by force are unrelated, except in the case of going aggro on PCs with whom her Hx is poorer than her Hard. The doc has good Cool (+2), so with Ice Cold, would go aggro at +2, but would not seize by force at +2--she's got steady nerves and the ovaries (OK, balls, whatev) to pull the trigger, but not so much ability to bring down an opponent who is actively fighting back.
But there'd be no point to doing that when I could just spend a couple of improvements to get Hard+2 instead, which is going to happen eventually anyway if the game goes on long enough to start filling out the angel's improvement list.
Also, in our game, we've never had the problem that article describes with seize by force. We use it by consequences, like Christian Griffen there does--if you're getting violent with someone who is immediately prepared to get violent back, or who is already getting violent with you, it's seize by force. As an example, when the doctor was attacked in her surgery by a violent woman over twice her size intent on infecting her with a horrible disease (no, it wasn't AIDS, ffs), the doc pulled her gun and went aggro first, of course--she failed, and then she got pinned and then the fight went right to seizing by force (which the doc somehow managed to succeed at, though I waived inflicting harm because obviously the doc would have her hands full just resisting, forget actually injuring someone that big with her bare hands, and doing that would be a case of using the rules in a way that makes no goddamn sense).