Actually 3 of them.
First. With blockaid up can you cure someone outside of your alliance?
Second. Does that then put that person on the hate list of the monster your fighting?
Third. Would that person then be able to cure you back or potentially steal your target even though you have blockaid up?
This is probably easily testable and if I don't get any solid data I plan to do that once I get out of work, but I don't get out of work for like 6 more hours and I'm really curious.
Feel free to n00bie forum this up I just figured I'd get a better result in the main forum.
XI Wiki

