Is the block successful, or does the Harass "fizzle" the moment the
prince untaps and ceases to become an eligible target?
Harass
(D) Enter combat with a vampire who has less than 4 blood or with any
tapped minion. This acting minion gets an optional press, only usable
to continue, in that combat.
Second Tradition
Requires ready Prince or Justicar.
+2 intercept. Also usable by a tapped Prince or Justicar, even if
intercept is not yet needed, to burn a blood to untap and attempt to
block with +2 intercept.
The former.
An action won't fizzle for lack of valid targets until it attempts to resolve
successfully (unblocked).
Many thanks.
jase