It is an error in the patch notes.
From 1.13 Skills.txt (patch_d2.mpq), line 53: Fire Wall
EDmgSymPerCalc: skill('Warmth'.blvl)*par8+skill('Inferno'.blvl)*par7
Param7=1, Param8=4 (%)
The synergy bonus from Fire Wall towards Blaze is also 1% per level and not 2% as stated in the notes.
For now, looking at the skill descriptions ingame seems more reliable.
This post was edited by Eywa on Jan 16 2010 07:03pm