You got it. And unlike other trinkets that increase your hp the health you gain does not go away when the stacks fall off.Originally Posted by Elunedra
Basically if you are at 50k hp and you take a 10k hit that procs the trinket you will have 40,393 hp out of 50,393 hp. If you don't get hit or healed for 10 seconds and the stack falls off you will have 40,393 hp out of 50,000 hp. The only time you lose hp is if you have 10 stacks and are at full health, ie 53,925 hp you would lose 3925 hp when the stacks fell off and be back at 50k.
A better way of interpreting the proc would be: You have a 60% chance of reducing the damage of an incoming physical hit by 393 (24 stamina for a raid buffed bear).