Wendy: " he's scared, fear can make people dangerous..."
That's... very wise actually, some of Wolfgang's lines do make it clear he is terrified of Wendy, which makes sense, he is scared of monsters and Wendy can just summon Abigail, a ghost, guess he feels terrified because she is followed by her, not to mention her lines about death, a bit funny though that if you attack a Wolfgang as a Wendy he will basically scream " Aaah! Creepy child is attacking me!" In response, he's this terrified of her.