It's very collegial and respectful to pretend you didn't hire someone you hired after they quit their last tenured job, sold their house, and moved across the country.
All that really matters is that we smile when we destroy each others lives. It's the tone the matters. Be nice people! Let's not get all hung up on who is killing whom!!!
I've been rolling my eyes at the tone police since the Iraq war. Mean signs were so much more troubling than, say, bombing the children to death. Be nice people!