Although he could not immediately extinguish the raging fire at his feet, Zachary could barely prevent the fire from spreading further.
Everyone is likely familiar with the method to contain a wildfire: it is not to enter the inferno to put it out but to first clear all flammable materials in the direction of the fire spread, establishing a sufficiently wide barrier. This can effectively prevent the fire from growing.
At that moment, the method to halt the fire was quite simple — removing all the Snake Skins in the fire's path far away. Once the flames lost the fuel provided by the Snake Skins, they would quickly diminish or even extinguish due to a lack of combustible material.
Compared to rushing into the flames for a swift extinguishment, creating a barrier suited Felix Lewis better, especially since the area he had chosen to work in was relatively open and conducive to clearing the Snake Skins and constructing the barrier.