Just a thought, but since you are basing this on the idea of vampire blood healing the other character. Possibly put a downside into the power. For example, in quite a few games where I have seen a power like this, the person that takes advantage of it runs the risk of becoming addicted to the blood. You could do something similar with this. If you heal someone they suffer an effect similar to "Addictive Saliva" in addition to having their consequences healed. Treat the effect/maneuver as an automatically successful attack with a rank equal to the level of the consequence. This might be appropriate both theme wise, and if the power was thought to be to powerful.

I like this. Most shows/books or anything I've seen have a downside of ingesting another things blood. Especially if it has supernatural properties.

I checked the teamwork rules (YS P. 208) and it seems like it can be used in combat based on the text, but I want to be sure. So I was wondering:   

Can teamwork actions be used in combat to create taggable aspects?

If so, is the target number still one or two less like on page 208 of YS?

Would it be possible for a player character to open a way in front of a charging opponent, the opponent go through it, and the PC close it?

If so, can someone give me a breakdown of how they would structure it assuming the PC has a Superb (+5) conviction and discipline?