"Great system questionable practice"

I have just attended the aspen surgery to receive my flu jab in the midst of the coronavirus pandemic. There was a very well thought out almost military operation to ensure patients maintain social distance and move through a one way system. I felt this was well executed and thought out. Unfortunately due to the rapid execution and reduced contact utilised the sleeve of my T shirt was not lifted and the vaccination was very quickly administered. Having been quickly escorted out of the building and reviewed the site of administration which was about 4-5 inches from my shoulder tip, appearing below my deltoid rather then central to the muscle. I am not experiencing any pain but am questioning the efficacy of the technique used and vaccination. I felt in the effort to reduce the risks associated with covid-19 that the efficacy of actual intervention was compromised by rushing patients through and using a poor technique.