Ok I followed this one up with staff & it was raised again in Beta Testing where the Vampire’s don’t “steal” any of Raffaele’s “Heal to 50%”.
This is the Staff Response:
Thank you for reporting! This is indeed intended behavior, Raffaele should always raise allies HP to +50% regardless of any status ailments.
So with confirmation from one of the QA staff, I am going to mark this thread as “working as intended” with the staff response to this thread.