Forget drug testing all you need is to listen carefully and you can hear from a punches impact that the person throwing it has been taking the equivalent to Asterix's magic potion. This was made perfectly clear in the OP. Add to that the fact that one pound of weight added by those imbibing Getafix's potion is equivalent to fifteen on anybody else and Emmanuel never had a chance. Listen even more carefully and you can hear an insistent whining sound, like kids crying because somebody told them Santa Claus isn't real.