The dominant soul in the body had become Ye Xiajie which is why despite him being called Meizhou his reactions would be totally different from the original Meizhou before Ye Xiajie woke up. This is because his memories are complete in this world, Meizhou would now be able to see System Yue his subordinate.
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The Tyrannosaurus Rex seeing that this original easy prey had become a harder bone to chew tried to run away. This is instinctive and intuitive reaction when meeting a Demon God being like Meizhou.
On the other hand, seeing this overgrown lizard suddenly wants to run away made Meizhou remember the reason why his wife is just watching from above the trees. It seems his soul fragment wanted to rebuild his confidence after seeing Xuebao show his unparalleled strength that one time.