What part of Snape does the word Severus touch that makes him take action?
From what we have seen of Snapes childhood, it was not a happy one.
During Order of the Phoenix, Harry glimpsed a memory in which Snape’s father was shouting and his mother was cowering.
By using Snape’s first name, what part of Snape is Dumbledore appealing to?
This question can be answered by examining the use of Severus Snape’s name.