Diablo Wiki

I had to fix the 3rd paragraph as it completely conflicted with the 2nd one:

2nd paragraph states it's useless against physical immunes: "This ability adds fire damage based on the user's physical damage (on top of the existing physical damage). Kicking a physical immune enemy results in an explosion that deals 0 damage."

3rd paragraph (old revision) stated seemed to imply that it's effective against physical or fire immunes - so long as they're not dual immune: "Despite this flaw, this skill is still powerful when fully utilized — particularly in Hell mode, where many monsters are immune to physical or fire damage, but rarely both."

This was incorrect, as the previous paragraph already contradicted this assertion.