en_tn/luk/01/22.md

They realized that he had seen a vision while he was in the temple. He kept on making signs to them and remained silent

These things probably happened at the same time, and Zechariah's signs helped the people understand that he had had a vision. It might be helpful to your audience to change the order to show that. Alternate translation: "He kept on making signs to them and remained silent. So they realized that he had seen a vision while he was in the temple"

a vision

The earlier description indicated that Gabriel actually came to Zechariah in the temple. The people, not knowing that, assumed Zechariah saw a vision.