Tamashi doesn't always win in a row. He has risked death many times than Yashu.
Although he is indeed the ultimate mortal, and even can resist the direct influence of the spirit, he is still a mortal after all. Moreover, all kinds of extraordinary means of the magicians are unpredictable and unpredictable. Until they control the Holy Land, the battles between the magicians are mysterious and unpredictable. Maybe an unexpected spirit can change the battle situation, not to mention the magicians and ordinary people?
Tamashi also served as the most dangerous judge martial servant, and each time he had to fight with the most vicious magician. What's more, most of the sorcerers in the waste land are actually the executors of the generation sects