When Interrupted or Silenced you have a X% chance to become immune to the next Interrupt or Silence mechanic. Lasts 20 sec.
Burning Determination is a mage talent that makes the mage become immune to interrupt or silence effects for 20 seconds after being interrupted or silenced. With two points in the talent, the effect will trigger on every silence or interrupt. This talent is mainly useful for PvP where multiple rogues, warriors, shaman and other classes with silences and interrupts can keep a mage locked down from casting for extended period of time.
Note that the first silence or interrupt is not prevented, only further ones after that. Also, this talent does not apply to "pushback" interrupts.
Patch 3.3.0 (2009-12-08): The duration of interrupt immunity granted by this talent is now 20 seconds.
Up from 10 sec.
Patch 3.2.0 (2009-08-04): Some Silence and Interrupt effects that did not trigger this talent will now trigger it properly, including Shield of the Templar, Garrote and Gag Order.
Edit
/
Patch 4.0.1 (2010-10-12): Removed. 
