Chase boss level

Hey folks!

I have an idea for a new level/boss Idea. What about a chase boss level?

Here is a reference taken from Rayman

http://www.youtube.com/watch?v=n2--XAolWF8

We have something similar in SL with chasing Red Beard in the red sun pirates campaign. Why not have something like that in PL too?
I am thinking of a level where the boss is invulnerable and you have to chase it down the level and if you take too much time some kind of lava/hazard will kill you.
For all the level you have to choose your class abilities to avoid/heal the boss attacks.
At the end of the level the boss will not be invulnerable anymore and can be harmed.
A dramatic background music would be sweet too :D

Suggestion delivered!