From where did Yogi emerge with Nandi theory?

Uttar Pradesh CM Yogi Adityanath responded to the SP-BSP-RLD alliance rally in Uttar Pradesh’s Kannauj which was disrupted by a stray bull.  Referring to bull as Nandi (lord Shiva’s bull) Yogi took a dig at the alliance’s rally and said: “I came to know that in Kannauj, Nandi Baba entered the ground during alliance’s rally and showed his ferocious avatar to those who provided protection to illegal slaughter houses in Uttar Pradesh.