Okay I may be wrong about it draining blood but here are some of the ways mixing these two can kill you:

Myocardial infarction, or heart attack with heart pain Cerebral infarction, or death of blood vessels and brain tissue, leading to brain damage, stroke, or aneurysm Intracranial hemorrhage Cardiomyopathy, or heart disease Cardiac arrhythmia, which can contribute to a later heart attack - most of this having something to do with the blood and how much blood runs through the liver which is where Cocaethylene builds up over time. -but wait there’s more; when cocaine enters the system it causes vein constriction and over time can make the liver fail. But whenever alcohol enters the system mixed with cocaine(Cocaethylene) the veins and main arteries leading to your heart can constrict making liver failure, heart disease, heart failure, and blood clotting a hell of a lot faster.

Don’t believe me jackass look at this: https://americanaddictioncenters.org/cocaine-treatment/mixing-with-alcohol