Without opening the can and asking how you know what was said or done... The NFHS says a fake tag, which is the act of a defensive player without the ball simulating a tag actually on an offensive player, is always considered obstruction. A base is always awarded for a fake tag. Furthermore, for this infraction like many others in NF rules, the umpire must issue a team warning. Another member of that team who commits the same infraction must be ejected. Based on what you saying happened, and given NFHS rules/casebook/guidance, the BU did not enforce the rule properly since he/she obviously judged that a fake tag occurred and NFHS has a penalty for that infraction. (Chalk it up to preventive officiating...)