HS Balk on Pickoff Move

[matt26036]

First year umpire. I saw something that I had never seen before and wanted some experienced opinions. High school right-handed pitcher attempting a pickoff at first in a JV game. Without moving his pivot foot at all, the pitcher clearly stepped toward first and made a pickoff throw. The baserunner's coach wanted a balk because the pivot foot did not turn or lift and the heel did not move. I didn't think it was a balk because the pitcher stepped to first. Now after reading the NFHS balk rule I am not so sure. Honestly I'm not sure how the kid turned his hips that far to make the throw but I watched him do it multiple times. I know my hips don't do that. What is the correct call?