When activated, this ability temporarily grants you 30% of your maximum health for 20 sec. After the effect expires, the health is lost.
Though battered and bloody, Warrax simply refused to fall.[1]
Last Stand is a Protection Tree Talent Ability, unlocked at 10 points of Protection Mastery. It is a short duration self-buff, costs no Rage, and has a 3 minute cooldown timer. When used, it temporarily adds 30% of the Warrior's maximum health, for 20 seconds. At the end of this time, these hit points are removed. [Glyph of Last Stand] reduces the cooldown from 3 minutes to 2.
A good panic-button measure, but try to think ahead to when the 20 seconds is up. Best used on the last fight of an encounter you simply have to survive.
Alternative talents at this rank are all very useful, particularly for tanking; Improved Shield Block, Improved Revenge and Defiance. This talent is only one point to unlock though, so as a route further into the Protection tree, is easy to include for that extra peace of mind.
This ability can save the raid during a boss fight or an unprepared pull on trash mobs. Make sure to let the healers know you used it as a warning to keep your health up because the effect will end and the extra health will be gone in 20 seconds.
Can be used in conjunction with Enraged Regeneration. This will increase your total health and thus increase the amount of health regenerated. This technique only works if you are less than full health when you start (true of most health gain techniques).
[Glyph of Last Stand] reduces the cooldown from 3 minutes to 2.
Edit
Patch 3.1.0 (2009-04-14): Cooldown reduced to 3 min. 
Patch 2.1.0 (2007-05-22): Turns warriors red instead of greenish blue.
