I think you've said it all. All I'm going to say is that as a leader in operations, I always encourage team leaders to be good human beings and to welcome their employees back to work. They know their employees the best.
Welcome them back to work, ask them if they're okay, and provide the support systems that Ann-Therese talked about if they're not. I think that's just being a good leader, so I certainly don't see it as harassment in the definition that we know.