if they destroy each other they both don't live up to it. irresistable force means nothing can stop it. immovable means the object can't be moved. in both cases beign destroyed contradicts that. something like that means it was a powerful force meeting an equally resistant object. the problem is the adjectives that are absolute. just like the god examples and the greek dog. god can't be absolute if he can't do everything. creating something he can't oppose is something so if he can't do it he isn't absolute but then if he can then he isn't abosolute because he can't oppose it and so can't do everything. Laelaps was a dog that always gets what it hunts but Jupiter turned it into a static star while it was hunting a fox. since it can't ever move again it can't ever catch the fox and so it doesn't always get what it hunts.