I’ve broken someone else’s bisque while glazing for them :/

One of my teachers at the studio, asked me recently if I wanted to work for them, as they need help with glazing. I’ve only started doing pottery few months ago, so I thought it would be a great way for me to learn and also earn money to pay for my new hobby 🤭 it’s been going well, but yesterday I’ve messed up. He gave me around 15 cups to glaze (bisque-fired) with handles that were really complicated. When I started glazing, I accidentally grabbed the cup by the handle (I know it’s a a big no-no), and it broke. He said it was fine, but I got stressed out, my hands were shaking, and as I was grabbing the other one, it fell out of my hands and another handle broke 🥲 he just looked at me quite annoyed, and said that he could forgive me one, but the second one is coming out of my pay (the cost of clay & firing). I thought this was fine and I was going to offer to pay for them anyway. But then I overheard him talking to a colleague, saying that he’ll just file them down and sell as cups. And that he knows the handles are tricky. Do you think that’s fair? I thought that the best solution would be if I paid for them, but I could keep them. I don’t think I’ll say anything, because I love my studio, and wouldn’t want to have any issues but this doesn’t sit right with me :/