It sounds as if this is another prime example of the game's lack of
internal consistency.
Sudently it seems like this topic is much bigger issue then i originaly thought. :-/
If you want, I think it's still possible for you to change the name of thread to be something like "Issues with the combat log and how damage boosts are handled" (i.e. removing the focus on Agonising Blast in the title, making the scope broader).
