User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-74.193.207.108-20120913212250/@comment-4212769-20120918132125

Another problem: When Agnaktor cooled down through the close body contact of Bracchidios means that Bracchidios would at the same degree heaten up. As your theory is built upon heat only that would mean, as it would heaten up more than usual that the slime would just explode. So that's quite unlikely.

About the Agnaktor armor: You know, in the introduction video in Tri the armor hardened as fast as here so it's just a programming thing. They wanted to show how it would look like with the armor hardened or in this case how the heated chest of Agnaktor accelerates the reaction that leads to an explosion. It could be explained that Agnaktor wasn't very long in the lava so it didn't heat up very much and could cool down and harden early even if it's not like that in the game itself.