R. Hanina ben Tradion was killed and the Roman authorities decreed that his daughter must stay in house of prostitution. She was the sister of the wife of R. Meir [of the Mishna]. R. Meir went to redeem her. The owner said, "If I let you redeem her, and the authorities find out, they will kill me." R. Meir said: "Just say this prayer, 'May the God of R. Meir save me.'" The other asked how do I know that will work? RM said lets go and find out. They went to a building that was guarded by savage dogs. The prayer worked. So She was redeemed and later in fact the authorities found out and tried to arrest the owner nd he said the prayer and was saved. Then the authorities found out that it was R. Meir that had caused the trouble and tried to arrest him and he fled to Babylon [in modern day Iraq].

In stories of the sages you see nothing like "stories of tzadikim" that aim to elevate the subject. However in this case there is an aspect of seeing the greatness of one of the sages of the mishna.