Mao Mao's father Hilard had the same suggestion for Nian Bing, prompting Nian Bing to stop pursuing high level magic, and instead develop at the level of basic magic. Starting from the basics, he could fully unleash the power of Fire and Ice Magic at its most basic level, and eventually high-level magic would then be able to explode with even greater strength. Thus, he had been focusing less on practicing dual-origin Fire and Ice Magic recently, instead choosing to separately practice each type of magic in order to fully understand their properties.
The first casualty of Nian Bing's research was Ru Yi. To conceal his identity, Nian Bing only used Ice Magic that day. If it had been any other day, his Blizzard spell would have shocked Ru Yi, but it definitely wouldn't have been lethal. However, that day was different. The Blizzard spell fully exhibited the characteristics of Ice, and his strong Ice magic drove the cold toxins into Ru Yi's body, almost taking her life.