From Page 44 of the RRG, v1.4:

WARNING (#21) Should read: “Interrupt: When a hero would take any amount of damage, reduce that amount by 1.” (Removed “(defense)” and the Defense trait.)

This make this card infinitely better as it can be used to mitigate Indirect damage, prevent damage to other players in Hero form, and doesn't require you to (or cause) attacks to be redirected towards yourself.

Excellent change, and more people should be considering this card to see if it is appropriate for their decks