I play both a priest and mage and begin to wonder about the scenario of them battling with the new changes. 4 secs of immunity to interrupts guarantees them 1 penance and a flash heal with
the borrowed time talent. and that's pretty much guaranteed every 12 secs.
That is nice but this is where the Strength of Time talent becomes interesting. Let's say them mage happens to get me to 1/4 HP left and i pop Pw: Shield and begin to channel penance. As a mage on live I will hit counterspell faster then you can imagine. Oops...IMMUNE! 24 secs of spamming heals to 100% unless i have a deep freeze handy.
Just saying it will take time for all you opponents to adjust to this change of immunity and even after they adjust I'm sure rogues will still occasionally accidentally kick or warrior pummel. The Immunity will also apply to Inner Focus. PW: Shield > Penance/Flash Heal > Inner Focus 4 secs more of immunity > Greater Heal. How many classes you know won't just instinctively press their interrupt during a long casted Greater Heal even though on the cast bar it shows immunity? oops IMMUNE!!! Time to spam heals to full!
So enjoy a awesome mechanic of PW:Shield and Inner Focus and enjoy a definite buff to our survivability.