Heating UpClient records describe this reading. They do not confirm availability in gameplay.
Non-periodic critical strikes with Fireball, Frostfire Bolt, Fire Blast, and Scorch reduce the cast time of your next Pyroblast cast within 20 sec by 25%, stacking up to 3 times. Fire Blast grants an additional stack every time it deals damage.
Now: Non-periodic critical strikes with Fireball, Frostfire Bolt, Fire Blast, and Scorch reduce the cast time of your next Pyroblast cast within 20 sec by 25%, stacking up to 3 times. Fire Blast grants an additional stack every time it deals damage. Was: Non-periodic critical strikes with Fireball, Frostfire Bolt, Fire Blast, and Scorch reduce the cast time of your next Pyroblast cast within 20 sec by 25%, stacking up to 3 times.
Sources: Game files · beta build 1.60.1.70425
No longer consumed if Presence of Mind was active for Pyroblast cast; now always gains an extra charge from Fire Blast
Sources: WoW Forever Beta Development Notes – Updated October 15
