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Hello and welcome to the community @alwaysjenius. I am sorry this happened to you.
It has occasionally been reported that the dragon has slipped past the middle column down the sides with no exit, but this seems to be a very rare occurrence. Because this will only affect players once and they are likely to pass on their next attempt there are few reports about this and King don't take any action to stop this from happening. In fact it may be part of the level design. I think it will only happen if the blockers are somehow removed in the wrong sequence, so on your next attempt watch out for that.
Unfortunately once we get the dragon caught in an impossible place with no exit there is nothing we can do but to replay the level and of course this will mean we fail the level.
This video shows how to play this level.