While hoping the blocking vampire doesn't diablerize the acting vampire, sure.
(Same as with a Ghoul Escort).
If the blocking vampire diablerizes the acting vampire, the continuance wouldn't
get far.
Just to be sure I understand...
"Cancel combat" and "continue the action" both happen but do not
depend on each other, so there being no combat to cancel doesn't stop
the action continuing (although the previously acting vampire going to
the ash heap does!) and, likewise, if continuing the action were
impossible (I can't think right now of how that would happen) the
combat could still be canceled.
Right?
Right.