Has any other Dom said the safe word to end a scene?

Some friends and I were discussing safe words and I had told them about my experience. Most were shocked that I (Dom) used the safe word.

Back story - several years ago my sub and I decided to dabble into KP. I laid out the following equipment on a table - a sterile disposable scalpel, alcohol wipes, Neosporin, betadine, bandages and surgical glue. I work in a hospital and have used both the scalpel and surgical glue before. My sub was restrained and as I was cleaning her thigh with an alcohol wipe, I had a gut feeling something was off. I said our safe word to end the scene. My sub eventually confessed, during aftercare, that she was scared to death but did not want to disappoint me by using our safe word. I then told her that she should have said our safe word. To me I'd rather have my sub say our safe than to blindly trust me when she does not feel safe. Our aftercare (yes I needed aftercare too) lasted for hours