User blog comment:ScalchopWarrior/Swampfire vs Heatblast?/@comment-24152851-20151130024723/@comment-24152851-20151130043535

It still wouldn't do anything to hurt him. Even if you flattened him with a rock, he would just tunnel underground and sprout somewhere else.

It's never made clear how Swampfire can be killed. And I don't think Heatblast is capable of doing it.