Thanks for all of your insight into the issue. If any of you are wondering about after the call...
Team A asked why it was a technical, so I explained my call as such "It was a deliberately aimed shot at the head of an opponent, and that is not a legitimate sporting play". They continued to protest their point, so I walked over to my partner and the supervisor of the night came over to the court to stand with us. My partner had called another tech on a different Team A player for saying something, i am not sure what. The supervisor told the players that were still arguing, that they have asked their question, they got an answer, and they must return to their bench or they will be asked to leave. All but one did return to their bench, the supervisor then removed this player from the game and the building.
Thankyou for all your feedback, it was only my second technical as a referee and I was concerned that I did not handle it as I should have. However, you have all reassured me. I plan to stay on the forum for a while to come now

, hope you all don't too annoyed with me