More Details about Gallanza's Hidden SBA
As recently discovered; Gallanza has a hidden SBA mechanic that allows him to call upon the SBA without having his gauge full. You simply have to use the SBA button during the ~1 sec animation where he is entering deathmatch.
I want to share some perhaps unknown details:
1. NO Deathmatch Finale: You CANNOT do this using the "Deathmatch Finale" skill.
2. Timing: There are two variances depending on your timing:
2.A <0.3 sec (Before he strips his armor): (Recommended) this is the better variation as you can retry the SBA if you miss or if the boss was immune to SBA.
2.B >0.3 sec (After he strips his armor): The problem with this, if you miss there's no second chance as you would already have entered deathmatch. The only advantage is that you get a bit of stun damage but only if you have the master trait which causes stun damage during the armor being stripped.
3. You CAN Chain SBA: YES! You can join the group's chain SBA if you do it right.
3.A Dodge-cancel technique: (Recommended/easier) Fill up your Deathmatch then dodge right at the very edge so that you don't enter deathmatch. Then, when the SBA chain window is up, attack and SBA during deathmatch animation.
3.B Timing prodigy: (Harder) It's essentially the same as above just without any dodge-canceling, so you need to be really good at timing it.
* Bots generally won't start an SBA if you were below 60%, so the above mostly applies in online multiplayer.
4. Your team DOES gain 10% SBA for free: Every time you do this hidden SBA, all your team mates get the 10% free SBA gain that they would get normally, so you are buffing your team (I guess).
5. SBA Cheese Spam: Well.... When you enter deathmatch, spam Y/Triangle and dodge cancel immediately, do this 3 times and this will bring you out of deathmatch very fast. Then, build up deathmatch and SBA. Pretty handy when your group is at a DPS check clutch. Note your DPS will drop a lot.
EDIT: SBA Spam is NOT a good idea as some bosses will retaliate harder, read this comment below (thanks to u/Xek0s for pointing this)
6. Spinning is better: If you have the master trait that allows you to max SBA just by doing a perfect turbine finisher, you can essentially reload your deathmatch meter while a boss flies away (Looking at you, Versa), then swat it with an SBA when he's back so your team has a good damaging window.
7. Not just spinning: Reaching level 10 on Wild Showman (from the Put on a Show tree) also allows you to do a hidden SBA as well. Timing shown on this video at 1:37 (Edited in, thanks to u/joe_6699)