This question is related to my other question. Please see that one for campaign background, rather than me repeating it all here.

I don't want the players to feel "trapped" and forced into a "tunnel", even though it's exactly what I do. Currently, I think I achieve this, here is how I have done it.

I have created 7 different ways to bring the players into a situation where the super-being is "pushed" inescapably into "freezing" them, as a consequence of their acts. I have enticed them into getting themselves into this situation by using their archetypes. One of the players is a brute that wants to fight and the other has a very physically weak character, so he needs to protect the brute from himself. The players created those characters by themselves.

Is there a better way to achieve my main goal (bring them into the frozen situation while activating the next game situation) while not bringing a "tunnel" effect?