http://www.wowwiki.com/Decimation
Patch Changes Edit
Patch 3.3.0 (2009-12-08): Redesigned. When [Shadowbolt], [Incinerate] or [Soul Fire] hit a target that is at or below 35% health, the cast time of [Soul Fire] is reduced by 20/40% for 8 seconds. Soul Fires cast under the effect of Decimation cost no shards. The Decimation effect is not consumed when you cast Soulfire
на патиче 3.3.0 изменили до 40%
так что ненадо грить про кату. изменили до катаклизма.
