I'm also no instructor...
What did your instructor think of your actions? That's who I would initially confer with... but I agree with the others above, there are times when you need to go out and find the problem. I've had many a CFI pull the fuse on me on various things... I usually see them do it, or figure the problem fairly quick, so usually ask do you want a flapless landing, or manual extension? or whatever... So what I'm getting at is, do you think the instructor was wanting you to find the problem, and fix it. Or to land the aircraft in it's current situation, and to handle the added challenge in the circuit?
Or in the case of a simulated gear failure... you obviously don't continue there, and you can tell the problem is the power supply if he pulls it... so the method there is to manually get the gear down. Going around, and or moving away like you did to sort it out.
Just my thoughts...