Yeah, correct. Fahmir isn’t purely combat fighter. He’s a strategist for leadership. The reason why he use rapier because he has insanely accurate accuracy to point that he could have aim for a very slim target accurately, but like what I said, it’s not innate skill. It’s prediction. Based on his description of Clairvoyance Phantasm, it gave him an inhumane clarity, like when people could hear even a faint heartbeat if they’re in a focused meditation.
Fahmir is actually very capable on close ranged combat, which is why his Third Stance, the Scattered Petals is basically repeated flurry of high-speed thrusting stab. It’s just that, he lack the overall strength to cause damage, might it be on long or short range, WITHOUT his special moves. And his special moves are only for finishing, each require few seconds of preparation. Basically, Fahmir is not good against relentless opponent.
And yeah… deceitful attacks like the Full Moon Draw and Twin Moon Draw could potentially went beyond Fahmir’s prediction, but it depend, since he might have gathered enough info on Rex’s fighting style to know that he’s unpredictable enough to execute two deadly moves in one go. Either way, the sheer speed is beyond Fahmir’s reaction speed. He may knocked bullets before, but that’s because he could foresee where exactly the bullet would go, and he know on which exact moment to swing his sword. It’s more like playing rhythm game for his mind.
So as long as he can predict it, and he’s fast enough to react, he can block it. But if it happen before he could predict it, or that he could predict it BUT it’s too fast for him to react, then it’s game over for him.
There’s a time on the canon where his strategy failed after successive accuracy. On the Spain arc, there’s these mafia group that got this one psychic who was seemingly asleep, Fahmir could not read her danger since she’s literally asleep, inactive, not pretending to be sleeping, but when one of his subordinate reach her, the girl just suddenly knock her out with telekinesis, to which even surprise Fahmir. This is similar to how Rex’s body react and it would makes Fahmir has very hard time to predict.