I recall now the example in the Amber rulebook where the invisible person tries to stab the high Warfare person, and the latter blocks it - the former is upset about it because he can't understand the logic of it - but really, it's the points difference in Warfare that counts, and you find reasons to make that outcome happen. So yes, fair enough - and actually very effective, because as QoA said, it's very much Sakura's style

*sigh* I guess the only way Michael's ever beaten either of sisters at this sort of thing is when he's been able to hunker down with a defensive sort of attitude and drag it out for as long as possible; they tend to give up after a while. It's been exceptionally nasty when they've chosen to gang up on him, which hasn't been often... He certainly finds it a bit annoying (okay, a lot annoying, a lot of the time), but in the end, the three of them are still closer to each other than to their other siblings - usually. There was that thing Lysandra had for Fairwayn at one point that was very uncomfortable for Michael...