Daresso's Defiance interaction with block?

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fae76 wrote:

Does PoE consider a blocked attack/spell as a hit?

The short answer is yes. The more in depth answer is that a blocked hit is still a hit, but blocking will, in general, prevent most of the attacker's on-hit effects along with the damage, while letting the defender's when-hit effects still occur.
This is more applicable to general "on hit" effects rather than the specific effects of skills.