To those of you who have played this game long enough to squeeze out as much damage as possible by chaining various attacks, you know what I'm talking about.
Strong / Heavy attacks sometimes have a very long animation, and it's most noticeable when you miss one of these attacks. However, when you land a hit immediately, you'll notice that another attack can quickly be performed.
But what if the last strong attack was the fatal blow on an enemy? There wouldn't be anything to follow up on and you would continue this long animation. The answer: Weak Attacks.
By following up a successful strong attack, it's possible to cancel the remaining animation with a faster animation; Weak Attack. This is useful because runs generally have around 10 Dex, more for Archers or other passive stats in other jobs that unlock special job, gender abilities.
For example, the F-Merch [→ B] has 2 maybe 3 parts to the attack. The first being the overhead swing, followed by a hard slam into the ground. A well timed [A] can cancel this long, ground smashing animation, resetting the Strong attack counter. So more [ B ] just by pressing [A].
TLDR: TOO BAD READ IT!