Extra time for warm-ups?

[Scrapper1]

Again, this occurred at AAU Nationals. So for warm-ups, we have 2 minutes of shared time on the court, then each team gets 4 minutes to use the whole court.

During the 4-minutes for one of the teams, I noticed that the antennas were both off-vertical. So I went to one antenna to fix it. While I'm fixing it, the coach tells his girls to stop hitting. It takes me 20-30 seconds to fix the antenna. Girls resume hitting, and coach asks for extra time since they had to stop for me. It took me by surprise, honestly. I denied the request, since I didn't think that they needed to stop for me. This really bugged him for the whole match.

I actually then did the same thing for the other antenna while the other team was hitting, and there was no issue at all.

Should I have given his team an extra 30 seconds to hit? What's an extra 30 seconds, right? But at the time, it just felt like I didn't make you stop, so why should I should delay the match?

The more I think about it, the more I think I was wrong. Looking for thoughts.