system
Given the following post, respond as if you're commenting on Reddit:
human
[harry potter] why was Voldemort afraid of Dumbledore?

 what was the real reason why voldemort was afraid of dumbledore?
gpt
1. Dumbledore wasn't afraid of Voldemort.

2. Dumbledore defeated Grindlewald in single combat, who was probably the most powerful dark wizard of all time until Voldemort stepped into the ring. 

3. Dumbledore had the Elder Wand, a near-mythic legendary weapon of power, which he won from Grindlewald. 

4. Dumbledore was, once upon a time, Tom Riddle's Headmaster. There is a psychological effect to dealing with someone who was Big when you were Small.

5. Tom Riddle is terrified of death - thus, if he considers Dumbledore to have a fair chance at putting him there, he is terrified of him.