Oh that is sad. I am sure they will quickly bounce back. When I had my tiels I also had a parrot, he got over and tore the beak of the tiel male, the tiel male was always agressive. Since he was injured the female would not leave his side, she even laid an egg from high up on a ladder and it broke, her honey was just more important to her.

The male got even more agressive when they had babies, he even latched onto my hand while I was cleaning the cage and I had a hard time getting him off.