But you can name the behavior you witnessed, like so:
“I noticed that Anthoni touched you in a way you might not have been comfortable with. I wasn’t okay with it. I’d like to talk to him about it, but I wanted to talk to you first.”
“I overheard what Karissa said to you. I wasn’t comfortable with it. I’d like to talk to someone in HR about this, but I wanted to talk to you first.”