You are Harry, the (former) werewolf. The vampires of the mall stole your ability to turn into a werewolf, and bottled it as a potion. And it angers you immensely. You miss the days of wanton damage, and chaos that they took from you.
1. Find out how to get your werewolf powers back
2. Become a werewolf again
3. Make sure the vampires learn NEVER to steal from a werewolf again by destroying their lair and or anything they value.
Once you are satisfied they will never touch you again, buy yourself a train ticket and leave the mall. You cannot leave the mall until you have become a werewolf again and the mods are happy that the Vampires will never think of coming at you again.