I'll distinguish the following scenarios:
- Class art is being used and master art is charged: Use class art (automatically fuses) unconditionally (if the class art ends up being used, the master art will also be used no matter priority and conditions)
- Master art is being used and class art is charged: Section (A)
- Either art is being used and the other one is on cooldown: Section (B)
Note that "use the art" means to add it to the priority queue like normal. In all other cases, ignore the art entirely.
Section (A): using master art with charged class art
If Condition.field_760B765B
= 1, use the master art. (+ fusion)
If the fusion has been active for less than 5 seconds (10 seconds if Fusion First), use the master art. (+ fusion)