How I think a failed Hide test in the case of a Black Rider (BR) is supposed to work:
1. Reveal BR
2. Add BR to staging area
3. Perform Hide test
4. Fail Hide test
5. BR engages player
6. BR makes attack
But where to we find a reference for the placement of step 2? This is important of course, because if step 2 comes after the Hide test, the forced engagement and attack won't trigger.
Then there's this from the FAQ:
Now, the phrasing of the H