Does the alliance make no attack? Are the titan stars kept, but with less life?
If the titan escapes (which is what I think you’re asking), the next titan that appears goes down in HP. I’m not sure if the amount of HP left when it escaped will affect the next spawning titan though.
That can mean you either get a same rarity titan but with lower HP – an 8* Gorgon Queen can have varying levels of HP – or you get back down to a lower rarity titan.
But it would descend in stars