Zara approaches the dying mage and sweeps them up into her arms. "Your light is already fading...no, don't worry little one. You may be too weak to satisfy my hunger fully, but I'll be more than able to enjoy your friends~"

Spoiler: OoC
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Skipping past the grappling rolls. Mage is unconscious and dying, so can't drain 1 Con a round to maximize Blood Charges. Instead will be draining 1d4+2 Con per round getting 3 blood charges per use. idk how much Con the mage has, so I'll just do a handful of rolls, and you let me know how many charges I got draining that one?

The others could try and interrupt the process, but if they're that much weaker than us...eh?

(1d4+2)[4]
(1d4+2)[3]
(1d4+2)[5]
(1d4+2)[4]
(1d4+2)[4]
(1d4+2)[6]

...yeah minimum there is 18 Con. If he has more than that...idk beefy mage I guess. XD