A Subaki is a Virtua Fighter 'Deflect' that guarantees a free Full DMG Combo. Each Virtua Fighter Guest has one Subaki that guarantees a 80-100 dmg combo if the Subaki is landed. However, two events happened on DOA5U Online that forced Yeam Ninja to Nerf each Subaki.
1. Unknown player/s complained that Akira, Pai, and Sarah's 'Special Counters'(Subaki's) were cheap by saying they 'had too much range and active frames'. Ironically, only Akira's subaki can be done without special requirements (I.E. doing a subaki's prerequisite attack). Most players didn't realize that some Akira users, like me, came directly from VF5:FS, so I use Akira VF style
2.Scrub VF Users abused the subaki's. I'm sure it was heard (at least once) that "People who use Sarah cheat!" This is because back in DOA5 Vanilla, 5PPP,64(Subaki),P, was the go-to strategy for scrub Sarah users for its ability to parry High and Mid Punches. The active frames for it, I think, was 12 frames. It was a Bread-N-Butter for people who liked using Sarah.
And No, Kokoro's 44P is not a Subaki, Its an attack parry. Its Team Ninja's attempt to 1UP Virtua Fighter Subaki's. Elliot, Kokoro, Leifeng, and Hitomi have them, but player's abuse these Attack Parries also. You wanna know that is?
Any DOA players are aware of the Triangle System, even if the haven't studied it. "Strikes>Throws. Throws>Holds. Holds>Strikes." However, if a 'Subaki' was added to the equation, then "Throws<Subaki>Strikes" would happen. In this regard, Subaki's destroy the Triangle System and discord the way the game is suppose to function
Akira's Mouko Kouhazan(9/3H) is the Strongest Subaki's of all the Virtua Fighter Guests. It stops High,Mid, and Low Punches and High Kicks. The active frames was 16 frames in DOA5 and was 13 Frames in the 1.03 Update.
It lasted about half as long than the standard DOA5 22 Active Frame Holds. Meaning, a Subaki can guarantee a combo that can do 70-90 DMG
That may be insane to a DOA Player, but for a VF Player that's natural. Subaki's are one of the things that made Virtua Fighter an in-depth fighting game. In VF, each character has their own "Edge" that makes them a scary opponent, even the ones that have no Subaki's
Its probably because your brother tried doing combos only. In Virtua Fighter, Combs are a bi-product of a player mastering a character. Meaning, combos aren't a requirement to win a fight in that game.
Most players who play fighting games look for "combos" rather than "techniques" because it is commonly viewed that combos win fights