Karl keeps drinking, feeling the heartbeat begin to flutter and weaken, and finally cease.

He had no desire to risk waiting, so Karl quickly slices open a wrist and begins forcing vitae into Gabriel's slack mouth, pumping out the viscous fluid.

Spoiler: OOC
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Given the length of their relationship, I think the answer would be yes Karl has on occasion fed on Gabe, but only when there was need and a lack of other sources. I think I'll go ahead and give him 3 points of vitae. give him some cushion without draining myself to the point of being hungry again as well.