@@kappa214, @@Thepumpkinking,@@Miss Reaper,
Rusty and Midnight saw Hank talking outside with somepony. They decided to check it out- why should Hank make new friend without them?
They were oblivious to what was actually happening, but they saw that Hank was looking kind of scared. They didn't get what was so scary. All there was was an injured man and a wolf. But, if Hank was scared, there was probably a reason. So, by instinct, they transformed into wolves. Growling, they tried to seem scary, though they were failing quite miserably.