He have a good metabolism in his body.
And eats allot of protein I presume.
The H2O2 and C2H6O is just used for disinfection of wounds, no more, no less.
The blood to coagulate and proteins/platelets to synthesis and function for clotting and
repairing the damaged area is purely based on the physiology of a person.
Some it takes days, but some under seconds like your friend here, but on average it
take for a small external cut, let say on the back of the hand takes about 3-20 min to
clot and gets completely repaired on the next day.