Terrifying for the controller who had to watch it unfold, terrifying for the pilots scrambling for an adequate resolution which was never forthcoming. We all know controllers make mistakes. We all know pilots make mistakes. We all know TCAS makes mistakes. When all facts are brought forth the correct action must be taken. There is no room for complacency from controllers, pilots, engineers, management...we are a team...we protect lives...priority number 1.
My thoughts and prayers go out to all involved...