Made by Muakasan
After the Hutao's first attack which applies pyro (which causes a reaction), there will be a hit counter and a timer.
Every third hit, Hutao will apply pyro to the enemies.
Additionally, if the timer reaches 2.5 seconds, the next hit will do 3 things:
1. Apply pyro regardless of the hit counter.
2. Reset the timer back to 0
3. Reset the hit counter back to 1
Also see the KeqingMains writeup: https://library.keqingmains.com/mecha...