A lot of people are reading it incorrectly, probably because blizzard worded it very poorly.

The correct way the hotfix SHOULD read is:

When you use fire blast to detonate frost bomb, FIRE BLAST does 50% less damage.

Actually, that's incorrect. Apologies for the poorly worded patch note. I've since updated the note to read:

• When Fire Blast modified by Glyph of Fire Blast is used to detonate a Frost Bomb, the resulting Frost Bomb now deals 50% less damage.

Some hotfixes weren't quite applied when the notes were published. That happens sometimes, but this change should be in soon.

12/11/2012 07:06 PMPosted by Magejerk

Also, thanks Daxxarri for clarifying.

My pleasure. Thanks for making sure word got around to threads where there was still confusion.