Bei Yan lit the incense flame?
Hadn't he run out of Heavenly Fragrance Grass?
There was no way around it, he knew Shi Hao would never agree to a life-and-death battle unconditionally. He would certainly demand that he lower his cultivation, and with his special physique able to break all restrictions, this was his turning point.
The problem was, these restrictions were set by the Great Sacrificial Heaven experts, and even the might of his special physique couldn't be unleashed. So, he had to light the incense flame to narrow the gap with the Great Sacrificial Heaven experts. This would only allow him to temporarily escape such suppression, and he still couldn't exert his full strength.
This also showed how powerful the Great Sacrificial Heaven experts were and how terrifying their dominance over the Supplementing Divine Temple was.
This was the power of his special physique, an ability inherent to Bei Yan himself and not considered cheating.
