Only by facing calamities could a person truly grow!
At the edge of this lava ocean filled with infinite and copious fire energies, what Leon obtained was not only being able to gather the Fire element energy. His innate talent affinity to Fire element was like a stranded fish put back into the water, allowing him to sense the progress of his Inferno Body at every single second.
If not because deep in his mind, the real-time data transmitted by the Chip was refreshing the progress of his Inferno Body continuously, perhaps Leon would have long given up and back off from the lava ocean, as he couldn't endure the severe pain that made him feel like he was being cooked by the raging flames.