OK, mnixon, Sir. With all due respect to you as a Flight Instructor, I must tell you that if all you ever did on go-arounds was from 50 feet, you have done yourself and your student a great disservice, and could have set him up for an even worse event. You must, repeat, MUST do some go-arounds from a ballon, a bounce, a sudden swerve as in a cross-wind during landing. Go-arounds from 50 feet are nothing! Recovering to a go-around from a bad flare or landing is everything.
This just comes from common sense. But, of course, the FAA can't bust you on not usung common sense, so they can find "regulations" which support the obvious violation. Such as:
FAR 61.87(c)(2) "Demonstrated satisfactory proficiency and safety, as judged by an authorized instructor, on the maneuvers and procedures required by this section..."
FAR 61.87

Limitations on flight instructors authorizing solo flight.
(1) No instructor may authorize a student pilot to perform a solo flight unless that instructor has- (ii) Determined that the student is proficient in the maneuvers and procedures prescribed in this section."
FAR 61.87 (d)(3)Takeoffs and landings, including normal and crosswind;
(14) Slips to a landing; (15) Go-arounds.
Look at page 8-3 in the Airplane Flying handbook. Chapter 8 - Faulty Approaches and landings. Balloning during roundout. When balloning i excessive, it is best to EXECUTE A GO-AROUND IMMEDIATELY; DO NOT ATTEMPT TO SALVAGE THE LANDING.
Those are not my caps, they are in the book.
You should have taught him everything in the book.
Now, I know how it is. You were probably badly trained. You were not taught all the techniques you should have in your quest to get your training, but you wer lucky, and that is the chain that must be broken. Don't pass on your instructor's mistakes to your student. Be as certain as you can about a student's ability to handle the airplane in the runway environment before you send him alone.