"Ainsley's Perfect Stealth" 

Maybe this happened because the one controlling the shaman's body wasn't the shaman herself but her spirit? 

The bull spirit could easily sense whether it was Ainsley herself or her in her shaman mode. 

It was definitely the latter, which means the spirit who controlled this body was the real ruthless one. 

From the way this spirit fought...they must be a tough lone warrior just like him! 

The bull spirit's eyes shone like stars and he subconsciously licked his lips wickedly. 

The life as a spirit inside the Spirit Cave is extremely boring, especially when other spirits aren't all battle maniacs like him. 

Now that he found someone who might be similar to himself...how could he not be excited? 

Thus, rather than thinking of killing the little shaman, the spirit changed his fighting style and went into a duel mode to pry each other's strength.