Forum:Clock Tower Prison ?

I was dueling my friend last night, and he displaced my Jurassic World with his Clock Tower Prison. He got his four counters on there, and turned his monsters into defense position. I was able to destroy his monsters in battle, but we have a misunderstanding on Battle Damage. I was wondering by my own understanding of Battle Damage, it is the destruction of a monster. If that is the case, then I wouldn't be able to destroy his monsters until I got rid of his Clock Tower Prison, but the definition of Battle Damage on this web site calls that battle damage to his monsters. What is the ruling?

Duelist33 18:37, 12 January 2009 (UTC)