Yesterday, we playes Siege of Skytower (it was brutal, and the luck went nuts. I have never seen so many heroic moves unlikely to work, ..that actually worked)

Anyway, I'm using Basic II for the first time, and I came into situations when I couldn't play e.g. Blinding Speed, because best target(Syndrael Knowledge 3, Awerness 2) was defeated. So I just wanted to make sure we played it right, I can' find the official answer: Can you target a knocked-out hero with the Blinding Speed and similar effect cards?

You played it correctly.

A knocked out hero may not
• use abilities or benefit from passive abilities unless explicitly allowed.
• trade with other heroes.
• receive Condition cards; he is immune to all attacks.
• suffer fatigue past his Stamina, nor [heart] past his Health.
• recover fatigue unless simultaneously recovering [heart].
• discard elixir tokens.
• be targeted by abilities (except healing abilities), as he is not on the map and spaces cannot be counted to him.

thank you!