Stage 3: Visitor King' disable attack.

Like the others said, you have a few seconds before the bomb goes off. The bomb isn't on the place you were frozen, its actually follows you. But if you move fast enough, you can avoid it easily. Try not to run towards other people who are attacking the boss after you were frozen. That will get your team mates killed if the bomb decided to blow up just after you passed them by.

You can break the chain with regular attack, but it doesn't always work. I've done it with my BM regular atk, but i can never seem to get it to work on my mage.