( CNN) Ted Cruz and Marco Rubio ultimately came of age as rivals vying to take the republican flow into a new generation. Jeb Bush took a stand. And Donald Trump said he won’t jump ship.

Tuesday’s CNN Republican debate was a last chance to shine for campaigners in 2015. It was a crucial clank before the hasten goes into the deep freeze over the Christmas and New Year holidays, with just seven weeks to go before the Iowa caucuses.

And as the first GOP showdown since the terror attacks in Paris and San Bernardino, California, discovered the alarming, expanded reach of ISIS, the showdown in Las Vegas offered a preview of how a Republican chairperson would reshape U.S. national insurance policy.

Here are five takeaways from a fiery nighttime in Sin City.

Cruz, Rubio fight for soul of the party