I know this Princess, and Princess Princess' opinion is:
her dad and brother have high blood pressure
they don't drink much, but when they go on a binge twice a month,
5-7drinks in an hour and their face goes tomato red, their background is white.
Both have high blood pressure history, with dad taking meds daily ad his son doesn't.
Princess does believe red face comes with high pressure thats too high on daily basis but suddenly goes really high in short time, and the person is not used to it(binges)
could ve done a reaction, since cannabis LOWERS blood pressure suddenly and because of cannabis the heart rate goes up out of a sudden.
So what happened to your friend could be: sudden rise in blood pressure(thats already normally high), the heart works harder/under pressure, sudden drop in blood pressure and heart rate goes up faster, the heart works much harder
if your friend was sitting down, hes blood pressure would be higher as well
This jump in the system could cause dizziness, blurry vision, tiredness, headache/migraine, chest pain, heart palpitations, foggy head.
*Note:Princess is not a full time doctor, Princess is a full time princess.