Does anyone know why zajef has mavuika on favonius?

https://preview.redd.it/lwn56p1o2obe1.png?width=271&format=png&auto=webp&s=d3e49ed087a17bb5e3900c21d787e689f401318e

its like the third video where its like that and he never talks about it

Edit: Thanks for all the answers, quick and efficient