On-block effects, such as the regen/heal on Defender runes, as well as Guardian runes, etc. aren’t proccing on warrior block skills vs projectiles when Shield Master is traited.
For example:
https://youtu.be/qTekd7eVb6A?t=8m15s
I don’t know if this is due to the block being reclassified as a reflect, but it’s inconsistent with the might on block associated with the trait (which is granted on projectile reflection) and how the unblockable effect is handled (which pierces the block).
I’m Biff Rangoon, and I approved this message.
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