The cat dies, punctured. Its feet, however, remain trapped in the stone floor.
The door to room three no longer radiates magic. The heroes pick themselves up (mentally) and continue forward.
Assuming you continue onward into room three:
[spoiler]
Room three is similar to rooms one and two, winding further around the tower, and ending in another door that radiates magic. This time, it's enchantment magic.
[/spoiler]